A scientist studied four fossils of a marine mammal dating back to 50 million years, 45 million years, 40 million years, and 30 million years ago. Which fossil is most similar to the present-day mammal?

Answers

Answer 1

The 30 million years ago, because its the closest one to us. Wait is there a picture to it ?

Related Questions

Eutrophication how can aquatic ecosystems change over time pogil answers

Answers

Eutrophication is a process that leads to enrichment of ponds, lakes and any water body with minerals such as nitrogen and phosphorus. Aquatic ecosystems are diverse and consists of phytoplanktons, zooplanktons, fish and other animals. Too much enrichment of the ecosystem adversely effects the flora and fauna of the aquatic bodies. Eutrophication leads to more uptake of oxygen and increases biological oxygen demand of water. With less oxygen available for animals inside the aquatic systems, they might began to die. Eutrophication is a result of human activities and must be minimized for the betterment of aquatic bodies and aquatic animals. Thus, eutrophication might lead to destroy the aquatic bodies over a period of time.

Final answer:

Eutrophication is a process in which a body of water becomes heavily enriched with nutrients, leading to excessive growth of plants and algae. Over time, this can lead to severe changes in the ecosystem, including hypoxia or anoxia. Human activities often drive this process.

Explanation:

Eutrophication is a process in the world of aquatic ecosystems where a body of water becomes enriched in dissolved nutrients (such as phosphates) that stimulate the growth of aquatic plant life, usually resulting in the depletion of dissolved oxygen levels. This nutrient enrichment can cause a rapid increase in the growth of plants and algae (known as an algal bloom), blocking sunlight, and eventually leading to the death and decay of other organisms due to the lack of oxygen.

Over time, affected ecosystems may change drastically. In severe cases, this can lead to phenomena such as hypoxia (low oxygen) or anoxia (no oxygen), leading to widespread death of fish and other aquatic animals. It's important to note that this process is often driven by human activities such as farming, sewage discharge, and urban runoff.

The term 'pogil' in your question suggests you're referring to a specific educational resource or assignment. Unfortunately, I cannot provide direct answers to your POGIL activity without specific details, but I hope the above explanation gives you a good foundation to start.

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What is the term for the layers of bony matrix surrounding the cell at a?

Answers

It is probably the lamellae.
The lamellae are sheets of bony matrix. This bony matrix is produced by osteoblasts, which are cells that synthesise collagen and specialised proteins like osteocalcin and osteopontin. These are then the most important constituents of the bony matrix.

A county commission is considering assessing a tax on residential water use above a certain amount. What might this tax be trying to discourage?

A- watering of lawns and other wasteful home practices

B- the routine practice of offering water at restaurants

C- the construction of new neighborhoods of sensitive lands

D- increasing construction of municipal pools and water parks

Answers

A.

The aim of a tax on a valuable resource, in this case residential water use, is to reduce wasteful practices. In this case the county is considering a special tax when residential water use is ABOVE a certain amount. This is an effective mechanism to reduce wastage by causing high users to incur more cost. Everyone will still pay for their water consumption in the normal way (typically by a $/unit cost), however the tax will take effect when the residential water consumption reaches a certain point. This penalises high users of water by forcing them to pay more for a valuable resource. Note that essential services like energy and water are often subsidised in society. This means that we do not pay the true cost associated with the use of the resource. Setting a tax that applies to those that consume over a certain threshold helps to reduce wastage of an undervalued essential resource such as water or energy.

Answer:

Explanation:

Repressor proteins are responsible for negative transcriptional regulation
a. True
b. False

Answers

The statement above is TRUE.
Negative transcriptional regulation involves the binding of the repressor protein to the operator in order to prevent a gene from been expressed. Transcription in eukaryotic cells is controlled by proteins which bind to specific regulatory sequences and modulate the activity of the enzyme concerned. Regulation of transcription can be negative or positive.

In the Grand Canyon fossils in rock layers at the bottom of the canyon are older or younger

Answers

In the grand canyon fossils in rock layers at the bottom of the canyon are older

Answer:

The lower the layer is, the older the rock is.

Explanation:

as newer layers are formed, they are added to the top.

As we sleep, the body maintains blood glucose levels by synthesizing glucose through:

Answers

Through gluconeogenesis. The lactate pass into the blood and is taken up by the liver and oxidized to pyruvate. Gluconeogenesis changes over the pyruvate to glucose which goes once more into the circulatory system, reestablishing that utilized by the erythrocytes.
Creatures can change over glucose into any carbon-containing particle they are equipped for integrating, while different atoms are fundamentally less adaptable. In creatures, acetyl-CoA can't be utilized as a substrate for gluconeogenesis. Hence, some different particles must be utilized to produce glucose

WILL GIVE A BRAINLEST
.

An increase in herbivore populations in an ecosystem will soon lead to _____.

decreasing vegetation growth

decreasing parasite populations

increasing predator populations

increasing vegetation growth

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a, decrease vegetation growth. Herbivores eat plants so the more they eat, the less plants there will be. :)

A kind of variable that a researcher purposely changes in an investigation is
constant
controlled
dependent
independent

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That would be the independent variable :)

i think its independent variable

True or false? in his description of new world plants, monardes condemned tobacco as a deadly, poisonous substance.

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False.
Monardes was a Spanish botanist and physician. He believed that the tobacco plant was incredible, had many pharmaceutical characteristics, and it worked as an antidote to many things such as a simple cold or even cancer. Because of his believes and studies, tobacco was actually very used throughout Europe in medicine.

As an animal ages and its hair turns white, the medulla becomes filled with
A. water.
B. melanin.
C. air.
D. fat.

Answers

The answer is c) Air

Answer:

B. melanin.

Explanation:

Melanin is a type of pigment that make our hairs coloured. When ages past, this pigment is produced in minor quantities, that's why we lost that natural colour in our hair.

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Which statement is not true of grasses?

They are similar to succulents.

They are resistant to extreme temperature.

They include grains.

They are the most widely distributed flowering plant

Answers

The correct answer for this question would be the third option. The statement that is not true of grasses is that, they include grains. Not all grasses have grains. But they can be resistant to extreme temperature and are widely distributed and they are similar to succulents. Hope this answer helps

The specialized tissue in the root that functions in food storage is the

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How does andrew knoll's idea that "prokaryotic metabolisms form the fundamental ecological circuitry of life; bacteria, not mammals, underpin the efficient and long-term functioning of the biosphere" relate to the nitrogen cycle?

Answers

Andrew Knoll's idea about prokaryotic metabolism from fundamental ecological circuity of life the bacteria but not the mammals, underpin the long-term and efficient functioning of the biosphere, it relates to the nitrogen cycle because of the bacteria is not emitting any nitrogen at all.

Andrew Knoll's idea about prokaryotic metabolism is related to the nitrogen cycle since some bacteria are responsible for this mechanism.

Some prokaryotic microorganisms are capable of using atmospheric nitrogen, in a process called biological nitrogen fixation in which N2 is converted to NH3 (ammonia).

Bacteria capable of carrying out this process encode a complex enzyme called nitrogenase, which is responsible for carrying out the fixation process.

The nitrogen cycle is the biogeochemical cycle on which the biosphere and all organisms depend for growth.

Nitrogen, being the most abundant element in the atmosphere, cannot be used by plants, however these bacteria can use it, and by associating with plants, they take advantage of nitrogen.

At this point, animals use plants as a source of nitrogen molecules, which does not require symbiotic relationships with fixing bacteria.

Therefore, we can conclude the nitrogen cycle is a vital circuit for the existence of life and it reaches us through a long chain of transmission, where prokaryotic microorganisms are a fundamental part of this cycle.

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A drug least likely to produce pharmacological violence would be a drug that made an individual __________. agitated and annoyed irritable and obnoxious sleepy or passive euphoric and giddy

Answers

"sleepy or passive"

A drug that leaves an individual sleepy and passive won't likely lead to any violence. These are called hypnotic or sedative drugs. These drugs are mostly benzodiazepines. They serve to calm and relax an individual and help in cases of insomnia, anxiety or anaesthesia. These drugs' effect is also dose-dependent which means that the more it is taken, the strongest/longest the effect.

The main goal of cellular respiration is the production of ___ molecules.

Answers

The purpose of cellular respiration is to convert the energy stored in glucose to ATP.

The goal of Cellular respiration is to produce 36 ATP molecules.

What does k-selection refer to?
a. species that produce relatively few offspring but invest a large amount of parental care
b. species that become extinct after a few generations
c. only egg-laying species
d. all species except primates?

Answers

a. species that produce relatively few offspring but invest a large amount of parental care. (For example: Elephants or dolphins produce live young and only one or two at a time and they take care of the children until they are okay on their own)

What is the primary type of mining that takes place under the bolivian mountain, cerro rico?

Answers

The Bolivian mountain found in the Cerro Rico de Potosi is also known as "the mountain that eats man". This is because many workers had lost their lives while working in the mines. Silver mining is the primary type of mining that takes place under this mountain. Bolivian mountain is the largest silver mine in the world.

What is meant by the following statement about the cell membrane? The cell membrane is said to be semipermeable.

Answers

it only allow certain substances to pass through it therefore the cell membrane is like a filter.

The cell membrane or a plasma membrane is a semipermeable membrane which means that this is a layer that allows only certain molecules that can pass through it. This allows the cells to keep their materials and the contents parted from the environment and from the other cells. This also makes the phospholipid bilayer an outstanding semipermeable membrane and protects the intracellular organelles from the environment that is outside from the cell.

Put these events of Earth’s history in the order that they happened: dominance of mammals, sharks and trilobites abundant in the oceans, dominance of reptiles, development of the ozone layer, plants and animals colonizing land.

Answers

development of the ozone layer
>> sharks and trilobites abundant in oceans
>> plants and animals colonize land
>> dominance of reptiles >> dominance of mammals

Answer:

- development of the ozone layer

-Sharks and trilobites abundant in oceans

- plants and animals colonize land

- dominance and reptiles

- dominance of mammals

Explanation:

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The building blocks (smaller subunits) of proteins are __________________________________.

I NEED HELP PLZZZZZ

Answers

the subunits are composed of linear polypeptide molecules which are polymers of twenty different amino.

amino acids, those are some of the building blocks

apply the Law of Conservation of Matter to the water cycle

Answers

The water cycle, also known as the hydrological cycle or H2O cycle, describes the continuous movement of water on, above and below the surface of the Earth.

The water cycle, or the hydro-logic cycle, is the continuous circulation of water within the Earth's hydrosphere. It involves the movement of water into and out of various reservoirs, including the atmosphere, land, surface water, and groundwater. This cycle is driven by radiation from the Sun. The movement of water within the water cycle is the subject of the field of hydrology. The water is a combination of processes that water goes through in nature. It can includes precipitation, infiltration, evaporation, transpiration, and condensation.

What nursing action is essential when a client experiences hemianopsia as the result of a left ischemic stroke?

Answers

Correct option: Place objects within the visual field

An ischemic stroke in the left side of the brain caused hemianopia to this patient. Hemianopsia is a decreased vision or blindness, in this case, left half of the visual field.
Can also be caused by brain tumor and trauma.

An igneous rock that _____ is made of really small mineral crystals.

Answers

Extrusive..
Hope This Is Right

it may be extrusive, have a wonderful day and good luck with school!

While mRNA strands are being created a sequence is sometimes miscopied. What is the best possible outcome, the worst possible outcome and the long-term effect on the cell if mRNA strands were miscopied?

Answers

The best and worst possible outcome and the long-term effect on the cell if mRNA strands were miscopied is that the cell will not make functional proteins from that mRNA strand. The best and at the same time worst possible outcome is that the cell will not make functional proteins from the mRNA strand.

Suppose you have engineered a plasmid vector in order to produce a functional animal protein in
e. coli. but the product you collect, while it has the correct amino acid sequence, is in fact nonfunctional. what might you try that would have a greater chance of success?

Answers

Although E. coli may have translated it correctly, it might not have the same enzymatic modification process present in the original organism where the genetic sequence was taken from. It might be worth trying this enzymatic modification, also called post-translational modification - it is done in order to make some changes to the produced protein (such as introducing a phosphate group) making it functional.

What can you conclude if the protein with an apparent mass of 45 kda is not detected in individuals who lack the dominant allele? that protein is probably coded for by the recessive allele that protein is probably coded for by the dominant allele that protein is probably expressed only when the recessive and dominant alleles are both present?

Answers

The answer is the second one.

Dominance in hereditary qualities is a connection between alleles of one quality, in which the impact on the phenotype of one allele covers the commitment of a moment allele at a similar locus. The main allele is overwhelming and the second allele is passive.
Consequently, I closed if the body has an absence of Dominance Allele, the protein is most likely coded for by the Dominance allele.

For their summer holiday, Jane and her family are visiting places surrounding the Mediterranean Sea. Which type of biome is Jane and her family visiting? rainforest shrubland tundra coniferous forest

Answers

The correct answer is Shrubland.

Jane and her family is going to visit shrubland biome. This biome generally get more than land than the desert and the grasslands but the rainfall is less than forested area. Some places that are found surrounding the Mediterranean Sea is California, Mexico, Chile, et cetera.

Nutrients dissolved in water are carried to upper parts of plants by tiny tubes partlybecause of the capillary effect. determine how high the water solution will rise in atree in a 0.0026-mm-diameter tube as a result of the capillary effect. treat the solutionas water at 20◦c with a contact angle of 15◦c.

Answers

The formula for the capillary rise is

h = 2λcosθ/ρgR
where
λ = 0.0728 N/m (surface tension of water)
θ = 15°
ρ = 1000 kg/m³ (density of water)
g = 9.81 m/s²
R = (0.0026 mm/2)(1m/1000 mm) = 1.3×10⁻⁶ m

h = 2(0.0728 N/m)cos15°/(1000 kg/m³)(9.81 m/s²)(1.3×10⁻⁶ m)
h = 11.03 m

Final answer:

Capillary action allows water and dissolved nutrients to be transported upwards in plants through tiny tubes called xylem. The height a liquid will rise in a capillary tube depends on factors such as surface tension, density, contact angle, and tube radius. A specific equation can be used to calculate this height, and in the case of water in a glass tube, the contact angle is 0°.

Explanation:

The height to which a liquid will rise in a capillary tube is determined by several factors, including the surface tension of the liquid, the density of the liquid, the contact angle between the liquid and the tube, and the radius of the tube. The equation 2T cos 0 h = rpg is often used to calculate the height h. In the case of water rising in a glass tube, the contact angle is 0°. To determine how high the water solution will rise in a 0.0026-mm-diameter tube, you can use this equation along with the given values of surface tension and density of water.

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While exploring the south american rainforest, a scientist discovers a mysterious organism and brings it back to the lab for further study. what cell characteristics should the scientist examine to tell whether the organism is an animal or a plant? why?

Answers

He should look for cell wall, vacuole and chloroplast. If these structures exist, it should be a plant cell. Only plant cells contains these structures.

PLEASE ASAP suppose you use a microscope to look at a cell from the skin of a onion. What structure will you see that would not be found in a cell from your skin? A. Endoplasmic reticulum B. Golgi Apparatus C.Cell wall D. Plasma membrane

Answers

The answer to this is C because humans don't have cell walls and if you are looking at an onion it has a cell wall because it is a plant.

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