Sunlight is the source of energy; plant sugars are the chemical produced.
Sirius B was an important star in ancient Egypt and was used to warn for floods on the Nile River. Is Sirius B brighter or dimmer than the Sun? *
a) Brighter*
b) Dimmer
Please help me with this question
A. Facilitated Diffusion
B. Active Transport
C. Simple Diffusion
D. Osmosis
Hydrogen Bonds are weak, but they hold water molecules together and are difficult to break. Which one of the following images correctly shows hydrogen bonding between water molecules?
A. Image 1
B. Image 2
C. Image 3
D. Image 4
Answer:
Option C, image 3
Explanation:
Hydrogen bonds are weak electrostatic bond that exist between hydrogen and an electronegative atom.
In order to have hydrogen bonding, the hydrogen must be bonded to an electronegative atom.
Generally molecules having hydrogen bonded to electrogegative atom, N, O and F show hydrogen bonding.
Hydrogen bonds may exist within a molecule or between two separate molecules.
Difference in electronegativity of hydrogen and electronegative atom develops dipole which responsible for electrostatic attraction.
In image 1 and 2, hydrogen bonding is shown between two oxygen atoms, which is not correct.
In image 4, hydogen bonding is shown between two hydrogen atoms, which is also not correct.
Hence, the correct option is image 3
Object A has a density of 10 g/cm3 and a mass of 9 g. Object B has a density of 10 g/cm3 and a mass of 4 g. Which object has a greater volume and by how much? Object A, by 5 cubic centimeters Object A, by 0.5 cubic centimeter Object B, by 5 cubic centimeters Object B, by 0.5 cubic centimeter
Answer:
Object A, by 0.5 cubic centimeter
Explanation:
Density (d) is given by :
[tex]d=\dfrac{m}{V}[/tex]
m is the mass of an object
V is its volume
For object A:
[tex]V_1=\dfrac{m_1}{d_1}[/tex]
[tex]V_1=\dfrac{9\ g}{10\ g/cm^3}=0.9\ cm^3[/tex]...........(1)
For object B:
[tex]V_2=\dfrac{m_2}{d_2}[/tex]
[tex]V_2=\dfrac{4\ g}{10\ g/cm^3}=0.4\ cm^3[/tex]...........(2)
From equation (1) and (2) it is clear that volume of object A is greater by 0.5 cm³. So, the correct option is (b) "Object A, by 0.5 cubic centimeter".
Research suggests that there are, on average, 25 battery operated appliances in a typical household. Because batteries contain toxic heavy metals, we should be thoughtful about their use. What is the LEAST acceptable behavior when it comes to battery use and disposal?
A) Take used batteries to a company that correctly disposes of them.
B) Use only electrically powered appliances and drastically reduce battery use.
C) Use rechargeable batteries, keeping harmful battery wastes out of the environment.
D) Take used batteries to a recycling plant so they can be used for some other purpose.
Alkaline and zinc-carbon batteries can be safely disposed of in your domestic trash in the majority of areas. Ship used alkaline and zinc carbon batteries to battery recyclers. Thus, option D is correct.
What batteries contain toxic heavy metals?When batteries are thrown away in California, they are regarded as hazardous waste. This includes single-use and rechargeable AAA, AA, C, D, button cell, 9-volt, and all other batteries.
Rechargeable batteries are dangerous for the environment and human health because they contain hazardous heavy metals like lead, nickel, cadmium, and mercury.
It is advisable to recycle or properly dispose of rechargeable batteries.
Therefore, take used batteries to a recycling plant, so they can be used for some other purpose, is the least acceptable.
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This drawing shows the internal anatomy of a sponge. What does the arrow in the middle represent?
arrow pointing from inside to outside through the main center large area of a sponge
Question 1 options:
the direction of the sponge's travel through the water
the path food takes through the digestive system of a sponge
the flow of water through the body of a sponge
the path sperm take to fertilize the egg of a sponge
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The correct answer is the flow of water through the body of a sponge.
The sponges are multi-cellular species in which the organ systems like the nervous system, digestive system, circulatory system, and others are absent. They possess a specific feeding system in which they maintain the continuous flow of water through their bodies. This water movement helps them to attain oxygen and food and remove waste.
The movement of water all through the body of the sponge is unidirectional in nature, it gets inside the body of sponge via ostia, and exit through the osculum. With the external pumping of water, the cells found in the walls filter out the food present in the water.
True or False: Wetlands and estuaries are critical ecosystems, but do not require protection. The answer is False
music question down below
Answer:
C (Third one)
Explanation:
What are 3 ways prokaryotes function differently from eukaryotes?
List at least four things you can do to improve your ergonomics
Answer:
Alternate work positions frequently, choosing positions that make you comfortable and relaxed; In case of repetitive activities, rest every 45 minutes and stretch your body. Use anti-reflective screens or insert blinds and curtains in your workplace (too much light can make you strain your eyes and contribute to discomfort and headaches); Keep your forearms parallel to the floor and your elbows at 90º or more open. If possible, use a wrist support in the case of tables that do not have rounded edges;Explanation:
In general, ergonomics involves knowledge and technologies that allow a comfortable and productive adaptation between man and the place where he works. The idea is to “shape” working conditions for greater comfort, efficiency and safety.
Although there are countless ways to improve our ergonomics, we can name four very useful ways to do this. These forms are:
Alternate work positions frequently, choosing positions that make you comfortable and relaxed; In case of repetitive activities, rest every 45 minutes and stretch your body. Use anti-reflective screens or insert blinds and curtains in your workplace (too much light can make you strain your eyes and contribute to discomfort and headaches); Keep your forearms parallel to the floor and your elbows at 90º or more open. If possible, use a wrist support in the case of tables that do not have rounded edges;in a solution a substance that is dissolved is called ----
Answer: Solvent
Explanation:
A solution is made of two substances one is solute and the other one is solvent. The substance that get dissolved is called as solute and the liquid in which the solute is dissolved is known as solvent.
The solute and the solvent combine together to form solution. It is a homogeneous mixture in which the solute and the solvent cannot be distinguished.
Hence the correct answer is solvent.
How do scientists determine the number of neutrons in an isotope of an atom?
Answer: They divide the atomic mass by two
Explanation: I'm too tired to explain Lol
What determines the genotype of an organism?
...parent to offspring
PLS HELP ASAP!!!!
James was exposed to a pathogen when he was 10 years old and felt ill.
What would most likely happen if he were exposed to the same pathogen when he is 12 years old?
A His body would destroy the pathogen before he felt symptoms.
B His reaction to the pathogen would be worse than the first.
C His antibodies would decrease, since he had been exposed already.
D New types of antibodies would be made in response to the second exposure.
Answer:
Answer: the answer is A Explanation:
How do watersheds affect water quality ?
a scientist discovers a new plant that has vascular tissue and produces seeds it has brightly colored scented flowers what type of plant did the scientist discover how might this plant be pollinated and what would lead you to draw that conclusion
Answer:
This plant is probably an angiosperm and its pollination is through insects.
Explanation:
We can conclude that this plant is an angiosperm because it is a plant that produces seeds.
Angiosperms produce root, stem, leaf, flower, seed and fruit. Considering these structures, note that in relation to gymnosperms, angiosperms present two "novelties": flowers and fruits.
Flowers can be eye-catching in color and shape; They also often give off a pleasant odor and produce a sugary liquid - nectar - that feeds the bees and other insects that will be responsible for pollination. There are also flowers that do not have colorful pieces, are not fragrant and do not produce nectar.
which of the following describes the location of the chromosomes during metaphase? a. located in the nucleus of the cell b. clustered at each pile of the cell c. lined up along the equator of the cell d. scattered throughout the cytoplasm of the cell
Final answer:
During metaphase, the chromosomes are lined up along the equator of the cell at the metaphase plate, which is a plane midway between the poles of the cell. The correct answer is option C, "lined up along the equator of the cell."
Explanation:
During metaphase, the location of the chromosomes is crucial for proper cell division. The correct description of their location at this stage is that they are lined up along the equator of the cell. Practically, this means they align in a plane known as the metaphase plate, which is situated midway between the two poles of the cell. Each chromosome is connected via its centromere to the microtubules that make up the spindle fibers, originating from the centrioles at each pole.
In this phase, sister chromatids remain attached to one another and the chromosomes are highly condensed, becoming maximally visible under a microscope. Visual identification is possible by looking for chromosomes that appear in a straight line across the center of the cell, signifying that the cell is in metaphase and not another phase of cell division.
What characteristics distinguish invertebrates from non vertebrates chordates
Invertebrates are animals that do not have a backbone or vertebral column, while non-vertebrate chordates are animals that possess a notochord at some stage of their development, but lack a vertebral column.
What are chordates?Chordates are a group of animals that are characterized by the presence of a notochord, a dorsal nerve cord, pharyngeal slits, at some point in their life cycle.
The notochord is a flexible rod-like structure that provides support to the body and serves as an attachment point for muscles.
The main characteristics that distinguish invertebrates from non-vertebrate chordates are:
Backbone: Invertebrates lack a backbone, while non-vertebrate chordates possess a notochord.
Complexity: Invertebrates are generally simpler in body plan and organization than non-vertebrate chordates.
Size: Invertebrates can range in size from microscopic to very large, while non-vertebrate chordates are typically small.
Diversity: Invertebrates are a very diverse group of animals, comprising the vast majority of animal species on Earth, while non-vertebrate chordates are relatively rare and include only a few species.
Symmetry: Invertebrates can exhibit a wide range of body symmetry, while non-vertebrate chordates typically exhibit bilateral symmetry.
Thus, these are the characteristics that distinguish invertebrates from non vertebrates chordates.
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how do scientific models help us better understand our world
living organisms are composed of millions of organic compounds each having a unique structure what element is responsible for this huge diversity of molecules describes and diversity of structures that can be formed and the properties of this element that allows this diversity of form to occur
Answer:
Carbon atom is responsible for this huge diversity of organic molecules.
Explanation:
Diversity of Structures:
The diversity of organic compounds originate due to following properties of Carbon atoms.
i) Catenation: It is the unique property of carbon atoms of self linkage. This property allows carbon atoms to form a long chains.
ii) Multiple Bonds: Also, the carbon atoms can form multiple bonds along with single bonds. Therefore, those organic comounds in which double or triple bonds are present are known as unsaturated compounds while, that containing single bonds are termed as saturated hydrocarbons.
iii) Isomerism: This is very important property of organic compounds in which more than one structure can appear for a same molecular formula. Hence, resulting in increasing the number of compounds for a single molecular formula.
Carbon is the element responsible for the diversity of organic compounds in living organisms.
Explanation:The element responsible for the huge diversity of molecules in living organisms is carbon. Carbon is unique in its ability to form covalent bonds with other atoms, including itself, allowing for the formation of long chains and complex molecular structures.
Carbon's ability to form multiple bonds and its flexibility in bonding with different elements gives it the versatility to form a wide range of organic compounds with unique structures and properties.
For example, carbon can form single, double, or triple bonds with other carbon atoms, resulting in the formation of different types of hydrocarbons such as alkanes, alkenes, and alkynes.
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Which of the following is true about rocks?
A) Rocks are composed of only one mineral.
B) Rocks do not contain any nonmineral matter.
C) Coal is not considered a true rock.
D) Most rocks are a mixture of minerals.
Answer: D). Most rocks are a mixture of minerals
Rocks are the natural substances these are the aggregate of one or more number of minerals. These minerals are responsible for chemical and physical nature of rocks. These are responsible for type of particles, texture of particles and overall rock structure. Example of rock having mineral aggregate is granite which is a combination of minerals like quartz, biotite and feldspar.
Rocks are a mixture of minerals (D).
Further Explanation:
Minerals are made up of large element, most elements are simple substances that can not breakdown into any other substance.
Most common example of minerals are Na,Si,Cl etc.
For example, SiO4 mineral contains large amount of element
Rocks are aggregates of minerals, rocks are major of three types:
Igneous Rocks Sedimentary Rocks Metamorphic RocksIgneous rocks are created when lava cools down and solidify in rock.
The metamorphic rocks are made by the subjection of igneous rocks and sedimentary rocks under high pressure and temperature.
The sedimentary rocks are created by continuous deposition of minerals, earlier rocks, and animal.
Example of igneous rocks are granite and made up of a mixture of element example SiO2 and Al2O3.
Examples of sedimentary rocks are breccias and siltstone and of metamorphic rocks are marbles.
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Answer Details:
Grade: High School
Subject: Biology
Chapter:Ecology
Key Words:
Soil, rock, mineral, mixture, granite, breccias, siltstone, sediments, metamorphic, igneous rocks, sedimentary rocks, silicon, deposition,earth sciences, substances, breakdown, pressure, temperature, element.
Tremor at rest, shuffling gait, stooped posture, and expressionless face are characteristics of?
A scientist is studying a cross between plants that are heterozygous (Xx) for a certain trait. She will use a table similar to this one to make a Punnett square for the cross.
Which percentage of offspring will most likely have the genotype represented by the letter A in this table?
0%
25%
50%
75%
Answer:
Option B, [tex]25\\[/tex] %
Explanation:
The heterozygous genotype of the parent is Xx
The punnet square for the cross between the two parents having Xx genotype is
X x
X XX Xx
x Xx xx
Thus,
A represents the genotype – XX
B represents the genotype – Xx
C represents the genotype – Xx
D represents the genotype – xx
Out of four possible genotypes, XX (A) appears only once.
Thus the probability of occurrence of genotype A (XX) will be
[tex]\frac{1}{4} * 100\\= 25\\[/tex] %
Answer:
B, 25 percent
Explanation:
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Which of these is an example of mechanical weathering?
Select one:
ice wedges creating potholes in the middle of a street
houseplants releasing oxygen into the atmosphere
waves lapping against the sandy shores of a beach
acid rain falling onto a marble statue in the town square
How is the United Kingdom planning to use driverless cars beginning in 2015?
Answer:
Government aims to modify the policy and design rules accordingly and also aims to incentive's any study in this area by technocrats . In this way United Kingdom is planning to use driverless cars beginning in 2015
Explanation:
As per the government strategy, it is believed that UK will first start using its driver less technology in mainly two segments -
a) Luxury riding services
b) Commercial vehicle such as haulage, cargo vehicles etc.
After this, the government has planned to introduce this for the consumer segment where an individual can own own (semi-) autonomous vehicles
Government has also planned to introduce a change in policy and design norms for the betterment of society. It has also attempted to partner with technological companies by providing incentives for citing their research and inventions in this era.
Answer:
C on edge
Explanation:
How do land Animals prevent water loss?
the group that includes human and their direct ancestors is called the
Answer:
The correct answer is hominids.
Explanation:
The group, which comprises modern humans and their direct ancestors are termed as Hominidae. It is also known as great apes or Hominids. Basically, the term Hominidae is considered for only the humans and their closest relatives. However, some of the people still continue to use this term in its limited sense, rather than in the modern sense.
Which description justifies why the theory of evolution is a theory and not a law?
A. Explains how organisms change in response to the environment
B. Predicts which organism is best suited to the environment
C. Supported by a small amount of empirical evidence
D. With more evidence it will become a law
Answer:
A. Explains how organisms change in response to the environment.
Explanation:
A scientific theory is an EXPLANATION of an aspect in the natural world. In other words, it just tells why something happens. Now it is not just a guess, it is well-supported by evidence and previous studies.
Now to knock out your other choices:
B. is wrong because:
A scientific theory does not predict. It can serve as a basis for a prediction, or what you call a hypothesis, but it does not predict an outcome.
C. is wrong because:
As mentioned earlier, a theory is WELL-SUPPORTED by evidence and previous research.
D. is wrong because:
A theory does not become a scientific law.
A. Explains how organisms change in response to the environment.
If a mineral breaks along flat or even surfaces, it has A. Luster B. Fracture C. Cleavage D. Streak
which of these systems is responsible fo breaking down food
endocrine system
excretory system
digestive system
lymphatic system