Mosquitoes developed DDT resistance through natural selection, where mosquitoes with a genetic variation that allowed for DDT tolerance survived and reproduced, passing these advantageous genes to their offspring. Therefore, the correct answer is option C. The ones which had a genetic variant that was tolerant of the DDT survived and reproduced.
The development of DDT resistance in mosquitoes is a clear example of natural selection at work. The correct answer to why mosquitoes developed resistance to DDT is C. The process works as follows: when DDT was widely used, it killed off a large proportion of the mosquito population; however, within any population, there is genetic variation. During this selection process, only mosquitoes with a genetic variant tolerant of the insecticide survived and passed on their genes to the next generation. Over time, these resistant individuals became more prevalent. This explanation is rooted in biology, specifically genetics and evolution.
To elaborate, female mosquitoes did not purposely choose to mate with resistant male mosquitoes to ensure fit offspring. Resistance developed because of a natural genetic variation that provided some mosquitoes with a survival advantage in a DDT-rich environment. Similar resistance patterns have been observed in Plasmodium, the protozoan that causes malaria, which has become resistant to anti-malarial medicines due to over-prescription and subsequent selection pressures. The outcome of such adaptations is an increase in the proportion of individuals with the advantageous traits in a population.
6. Animals have many adaptotions for survival Describe each adaptation
below, and explain how it could help on organism better survive its
environment
A.camouflage
B.mimicry
C.venom
Answer:
Explanation: camouflage is an adaptation that helps organisms blend in with its surroundings. Blending in helps the animal avoid predators and increases its ability to survive.
Mimicry is an evolved resemblance between an organism and an object which protects them from predators for example how moths evolved to be brown like bark on trees helps them to blend in and reduces their chances of being eaten.
Venom helps animals to immobilise or kill prey or neutralise predators in self defence this benefits the animal because they are less likely to be attacked by predators
Animals have many adaptations for survival. By adapting, the organisms are able to live in their environment in a much better way. These adaptations can be of many types.
What is adaptation?Adaptation in organisms refers to the process by which species change over time in response to changes in their environment. This process, also known as biological evolution, occurs through a combination of genetic variation and natural selection.
Camouflage- It is a type of adaptation that enables an organism to blend in with its surroundings, making it less noticeable to predators or prey. This allows the organism to avoid detection or to approach its prey without been seen.Mimicry-In this type of adaptation, the organisms resemble another organism or an inanimate object in its environment. This allows the mimic to blend in with its environment and avoid detection by predators or to attract the prey.Venom- It is a type of adaptation which enables certain organisms such as snake, spiders, and scorpion to capture prey or defend themselves from against predators. Venom is a toxic substance that is produced through the specialized gland and ejected through special structure, such as fangs or stingers.Therefore, it can be concluded that through the process of adaptation, the organisms are better able to survive in the environment in which they are present.
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Asexual reproduction provides an advantage to organisms under which of
the following conditions?
Umm so this question is throwing me a little. C makes some sense to me, as if there is direct competition, being able to practically duplicate can become useful. A doesn't make sense to me because if there is a decrease in resources, cloning isn't an advantage because there is no variation and therefore no members in the population that could utilize other resources and survive. I don't see how, when being seperated (B), asexual reproduction is very advantageous, as I guess a bigger population could allow the seperated organisms to join together again but that's not much of an advantage. D.... I mean if predation is lowered I GUESS being able to make exact copies of the same organism is a kind of advantage...I'm not 100% sure but I'm leaning towards C, though D may sense too. I hope I can help a little, at least to narrow down some choices. Have a good one!
What are the stages of secondary succession
Answer:
Sequence of events that occur in secondary succession
Secondary succession is one of the two types ecological succession of a plants life. As opposed to the first, primary succession, secondary succession is a process started by an event (e.g. forest fire, harvesting, hurricane, etc.) ... Seeds, roots and underground vegetative organs of plants may still survive in the soil
Explanation:
mark brainlest plz
Secondary succession involves a disturbance in an environment, the establishment of pioneer species, competition between species for resources, and finally stabilization, with a climax community being formed. Each stage contributes to diversity until stability is achieved.
Explanation:The stages of secondary succession involve various phases from the growth of organisms in an environment after a disturbance to the establishment of a climax community. The stages include:
Disturbance: This is the initial change in the environment which can be natural or human-induced. Establishment: Opportunistic species known as 'pioneer species' colonize the area first, usually plants or lichens. Competition: As more resources become available, other species compete to colonize the area. Stabilization: A climax community is formed once the establishing species are outcompeted.
In all stages, each subsequent appearance of flora and fauna contributes to diversity in the ecosystem until stability is achieved.
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What type of rock forms due to high pressure?
A. Metamorphic
O B. Igneous
O C. Sedimentary
O D. Shale
Answer: metamorphic
Explanation:
Your body saves every part of the food you eat.
TrueOr False
Answer:
False, you can save every food you eat it just goes to your stomach then the rectum
-Hops
Which sustainable building practice does the photograph show?
Does the image demonstrate the sustainable building technique of adopting high-density dwellings to conserve resources. So, the correct option is C.
What is conservation of resources?Conservation is the process of looking after some of these resources in order that all living creatures can use them in the present and the future. Everything we need to survive, including food, water, air, and shelter, is derived from natural resources.
We may conserve the resource by recycling it. For instance, a lot of things can be recycled or used to make new ones. Paper, plastic, glass, metal, and even electronic products are recyclable resources. In the above given example, the image demonstrates the sustainable building technique of using high-density dwellings to conserve resources.
So, the correct option is C.
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Your question is incomplete, most probably the complete question is:
Which sustainable building practice does the photograph show?
A. Replacing wilderness with buildings to reduce the absorption of
carbon dioxide
B. Reusing old bottles and cans as insulating building materials
C. Using high-density housing to conserve resources
D. Reducing fossil fuel consumption and its associated pollution
SUBMIT
Leaves fall from deciduous trees onto the forest floor. These leaves decay slowly and become part of the topsoil. Which change is MOST likely to have a positive impact on the nutrients available in the topsoil?
an increase in the number of decomposers
a decrease in temperature
an increase in the number of predators
a decrease in biodiversity
Answer:
Explanation:
An increase in the number of decomposers ... Leaves fall from deciduous trees onto the forest floor. These leaves decay slowly and become part of the topsoil. Which change is most likely to have a positive impact on the nutrients available in the ... Which explains why the size of a population of rabbits might be decreasing.
The change that is MOST likely to have a positive impact on the nutrients available in the topsoil is an increase in the number of decomposers.
Decomposers are microorganisms that can break down organic molecules into smaller components.Decomposers include different groups of organisms such as, for example, bacteria and fungi.Decomposers play a fundamental role in the biogeochemical cycles and foods webs.In conclusion, the change that is MOST likely to have a positive impact on the nutrients available in the topsoil is an increase in the number of decomposers.
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What can occur in plants and animals that result in changes? (Choose all the apply)
a
random trait mutations
b
modifications
c
growth factors
d
none of the above
I think the changes will be growth factors
Answer:
i dont even know but i believe it is random trait mutations.
Explanation:
Viruses cause infection by ...
a) producing toxins that harm the body.
b) forming endospores in the body.
c) entering body cells and replicating.
d) reproducing independently inside the body.
Answer: (A)
Explanation:
An infectious disease is a disease that is caused by the invasion of a host by agents. Some pathogens then spread between host cells or inside of body fluids, while harm (damage) is usually due to the production of toxins or devastating enzymes.
Which statements are true of a white dwarf?
a. It has a red shell.
b. It is the result of the core collapse of a low-mass star that sheds its outer layers.
c. It emits massive amounts of light compared with other stars.
d. It strongly attracts all matter or energy that comes near it.
e. It cools down to become a black dwarf.
(you can choose multiple)
ANSWER FOR 44 POINTS AND BRAINLIEST Janelle wants to buy some strings of decorative lights for her home. She is trying to decide between two strings of lights that are wired differently.
How should Janelle’s lights be wired, and why?
Janelle should choose decorative lights with bulbs that short circuit when they burn out since the other bulbs will remain lit. The normal operating voltage for 40 bulbs on a 120 V string is 3 V each, and if one bulb burns out in newer strings, the others operate at 3.08 V each.
Janelle is trying to decide how her decorative lights should be wired for her home. The older lights wired in series with bulbs that act like an open switch when burnt out will cause the entire string to go out if one bulb fails. For such a string operating on 120 V with 40 bulbs, each bulb would normally operate at 3 V (total voltage divided by the number of bulbs). On the other hand, newer lights with bulbs that short circuit, behaving like a closed switch when they burn out, will allow the rest of the bulbs to remain lit. With one bulb out, the remaining 39 bulbs on a 120 V string would each have an operating voltage of approximately 3.08 V.
If comparing brightness in bulbs wired in series, the one with the higher resistance (usually the one with the lower wattage rating) will be brighter, due to the voltage division in series circuits. Therefore, a 60 W bulb would typically be brighter than a 100 W bulb when connected in series to household power.
Why reason best illustrates why Hershey and Chase chose to use viruses in their experiments?
A.)Viruses are made up of the two things that scientists were studying at the time, proteins and DNA.
B.)Viruses cannot make humans sick, but bacteria could.
C.)Viruses are immune to radioactivity and cannot be degraded by it.
D.)Viruses are easy to obtain and manipulate.
Final answer:
Hershey and Chase chose to use viruses because they are made up of DNA and proteins, and bacteriophages, in particular, inject only their DNA into the host cells. This was essential for proving that DNA is the genetic material responsible for heredity.
Explanation:
The reason that best illustrates why Hershey and Chase chose to use viruses in their experiments is A.) Viruses are made up of the two things that scientists were studying at the time, proteins and DNA. Hershey and Chase were focused on determining whether DNA or proteins were the genetic material responsible for heredity. They used the T2 bacteriophage, a virus that infects bacteria, particularly E. coli, because a bacteriophage's life cycle involves attaching to a bacterial cell and injecting its genetic material into the host. Unlike animal viruses, which enter the host cell completely, bacteriophages like T2 only insert their nucleic acids (DNA), leaving their protein coats outside.
By using radioactive isotopes to label DNA and proteins separately, they could trace the fate of each component after the T2 bacteriophage infected the bacteria. They found that only DNA entered the bacterial cells, leading to the production of new viruses. This provided strong evidence that DNA is the genetic material, as proteins did not enter the cells. Therefore, the use of bacteriophages, which separated the involvement of DNA and proteins during infection, was crucial for their experiments and the discovery that DNA contained the instructions for heredity.
plz i need help!!! describe three factors that affect the climate of an area.
Answer:
Three factors are:
1) Distance from the sea
2) Ocean Currents
3) Direction of prevailing winds
What do producers do with carbon? (little information needed)
Answer:
They transform it into oxygen through cellular respiration
Explanation:
Both GMOs and unmodified heirloom plants are commonly able to pass on genetic material through "Blank" gene transfer without human assistance.
Answer:
Energy
Explanation:
I honestly don’t know
Answer:
The Answer is Vertical Gene Transfer
Explanation:
I got it right on the quiz!
4. Are single celled life forms more or less complex than multicellular organisms? Defend your
answer
the traits of the offspring are the ____ variable. genes of parents are the _____ variable
Answer:
dependent, independent if that's whats in the dropbox
Explanation:
Answer:
dependent, independent if that's whats in the dropbox
Explanation:
Explanation:
If finches on the Galapagos Islands had such different beaks, how could Darwin think they shared a common ancestor from the mainland?
Answer:
i just learned about this
Explanation:
its because each began to live in different areas on the Galapagos islands and they each needed to adapt to their meals and their surroundings. So simply evolving and adapting
I hope this helps u!
Pls give a brainliest and a thx ;)
Despite the different beak shapes of Galapagos finches, Darwin believed they shared a common ancestor from the mainland due to other similar traits. This lead to his theory of evolution through natural selection and adaptation, suggesting species change over time due to environmental factors.
Charles Darwin observed that finches on the Galapagos Islands had different beak shapes. Despite these differences, he concluded they all shared a common ancestor from the mainland because of the similarities in their other physical traits and behaviors. Darwin proposed the theory of evolution through natural selection and adaptation, suggesting that species change over time because of environmental factors. In the case of the Galapagos finches, the different beak shapes evolved due to the different types of food sources available on the islands, a process known as adaptive radiation.
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A person with Type O blood has the following alleles for blood group:
a) IBi or IBIB
b) IAIB
c) ii
d) IAi or IAIA
C, ii, since type O blood is recessive.
Answer:
c
Explanation:
Type O blood is the recessive trait, so you would need both recessive alleles to have type O blood.
In 2003, the city of Rochester, New York, began killing weeds with steam. A machine heats water to 280°F then sprays it on the weeds with great pressure. The extreme heat destroys the cellular structure of the plants. What is a possible disadvantage of this method of weed control? *
Answer:
"The success of the steam application on weed burndown depends on a thorough canopy and stem penetration. For instance, the steam application was found to be relatively ineffective on certain weeds, like pusley, due to their prostrate (creeping) growth nature, which prevents an adequate coverage of steam on the entire plant....some of these weeds are adapted to grow back from the steam burndown." -VSC News
Explanation:
I googled it and found this on a news website, so these are not my words. :) I hope this helps.
Final answer:
The main disadvantage of using steam for weed control is its potential non-selectivity and the need for repeated applications for perennial weeds, along with the high costs and energy use.
Explanation:
A possible disadvantage of using steam to control weeds, as practiced in Rochester, New York, is that while steam effectively destroys the cellular structure of plants, this method might not be selective, potentially harming non-target plants in the vicinity. It also targets only the surface growth, often requiring repeated applications to address regrowth, particularly from perennial weeds. There may also be concerns over the costs and energy requirements associated with generating high-temperature steam for large-scale application.
If artificial eutrophication continues, what do you think will eventually happen to an ecosystem of water?
Answer:
Ecosystem will be negatively impacted.
Explanation:
Eutrophication is the process in which the amount of nutrients in a water body increase due to the run off from the nearby agricultural land.
Due to the enhancement of nutrient content of water, the productivity of water plants increases and they increase in number rapidly thereby covering the surface of the water body. This restricts the dissolution of oxygen in water from atmosphere and also causes depletion of existing dissolved oxygen. In absence of sufficient oxygen the water animals start dying.
Artificial eutrophication can disrupt a water ecosystem by causing overgrowth of plants and algae, leading to oxygen depletion and ultimately the death of marine life.
Explanation:If artificial eutrophication continues, it could have devastating effects on a water ecosystem. Eutrophication is the process where a body of water becomes overly enriched with minerals and nutrients, which induces excessive growth of plants and algae.
This overgrowth could cause a significant reduction in oxygen levels in the water body, leading to the death of other aquatic species such as fish. As the plant and algae die off, bacteria break it down, further depleting the oxygen, leading to a state called hypoxia or anoxic condition. As a result, the water body eventually becomes a 'dead zone' devoid of marine life, disrupting the balance of the water ecosystem.
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Harriet is testing the hypothesis that her cat is faster than her dog in a short sprint. She times her cat, Mittens, as it runs 30 meters. She then times her dog, Mandrake, as it runs the same thirty meters.
Animal
Time (seconds)
Mittens
3.4
Mandrake
4.1
Can Harriet conclude that her cat is faster than her dog?
A.
No; Harriet should race the animals several times before she makes that conclusion.
B.
Yes; since Mittens finished with a faster time than Mandrake, he must be a faster runner.
C.
Yes; since Harriet's data agrees with her hypothesis, it must be correct.
D.
No; Harriet should time her animals at much longer distances before she makes that conclusion.
Answer:
A.
No; Harriet should race the animals several times before she makes that conclusion.
Explanation:
When you make a conclusion, you have to consider that your data can come out differently each time. After you race them about 5 times or so, collect the data and find the average time of each one, then you will get a basic idea of which one is faster.
Answer:
A.
No; Harriet should race the animals several times before she makes that conclusion.
Which factor is NOT needed to calculate a moving object’s average speed?
A. total time
B. total distance
C. total displacement
-------------------------
An arrow representing the velocity 3 m/s east and an arrow representing the velocity 6 m/s east would have the
A. same direction and same length.
B. different directions and same length.
C. same direction and different lengths.
D. different directions and different lengths.
-------------------------
10. Which equation could be used to solve for the average speed of a car that travels 90 m in 20 seconds?
A- Average Speed= 90m/20s
B- Average Speed= 20s/90m
C- Average Speed= 90m x 20s
D- Average Speed= 20s + 90m
Answer:
Q1. C Q2. C Q10. A
Explanation:
Q1. Displacement is used to calculate mass, weight, or density.
Q2. Since they have different velocities, but same direction.
Q10. S= D/T (Speed = distance / time)
Answer: Q1.
Explanation:
Which are uses of lasers? Check all that apply.
scanning a bar code on a price tag for a shirt
creating a magnified image of the moon
cutting an iron bar into two pieces
reshaping a cornea to improve vision
making a leaf appear larger so its veins are visible
Answer:
Scanning a bar code
Reshaping cornea
Explanation:
Answer:
a
Explanation:
Although outer space can be extremely cold spacecraft must also be able to release excess heat different parts of a spacecraft may need to be heated or cooled in different situations since outerspace is there perfect vacuum the main way that he is expelled is
Answer:
with radiators that release electromagnetic radiation into space.
Explanation:
Spacecraft use radiators that release electromagnetic radiation into space to get rid of excess heat.
Since outer space is a near perfect vacuum, this means that many of the common ways that heat is expelled on Earth do not work in space. Since spacecraft do not touch any other objects in space, they cannot lose heat through conduction. Since there is no air, they cannot lose heat through convection either. Instead, spacecraft use specially designed radiators, which emit excess heat as electromagnetic radiation—infrared light.
Please answer!
Which two sentences describe ways that populations might be harmed by floods?
A. Organisms that thrive in moist condition have more places to live.
B. Animals who’s shelter are in land drown while the land is underwater
C. Plants that were living in soil that is washed away are killed.
D. Animals that lay eggs in water have more chances to reproduce
Answer:
C.
Explanation:
Answer:
B. Animals who's shelter is in land drown while the land is underwater.
C. Plants that were living in soil is washed away and killed.
Explanation:
I hope this helps
Identify the equilibrium point between the positively charged and negatively charged spheres.
Answer:
D!!!!!!
Explanation:
Why does the sun appear to rise in the east and set in the west every day?
A.) Earth is rotating counter clockwise
B.) The sun is moving from East to West
C.) All moons and stars have an East to West orbit
D.) Earth is orbiting the sun
Answer:
A. Earth is rotating counter clockwise
Explanation:
The Sun, the Moon, the planets, and the stars all rise in the east and set in the west. And that's because Earth spins -- toward the east. ... Earth rotates or spins toward the east, and that's why the Sun, Moon, planets, and stars all rise in the east and make their way westward across the sky.
Let me know if this is wrong...good luck and hope this helped!
In dogs, black fur (B) is dominant over yellow fur (b). A heterozygous black dog is matted with a yellow dog. Do a Punnett square to show the cross and predict the offspring.
At which phase of the cell cycle are spindle micro tubules from the centrosomes able to be observed?
Answer:
Metaphase
Explanation:
During metaphase, spindle fibres that are already attached to the centromeres of chromosomes from the centrosomes at the opposite poles of the cell lengthen and shortens to position the chromosomes on the metaphase plate. At this stage, you can see the spindle micro tubules through a microscope.