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creativ13 [48]
2 years ago
5

When Darwin wrote on the origin of species he assumed due to the fossil record that species would not evolve quickly since that

time evolutionary theorists have documented example of much more rapid evolutionary change now how would we explain the long periods relative consistency with little change in some species that we see in the fossil record?
Biology
1 answer:
noname [10]2 years ago
5 0
If there is no reason to change (constant climate), then change won't occur. For example, a desert is basically always dry and hot with sand and few clouds. If a creature is fit for the climate, it will continue to exist until a severe enough climate change. For a real world example, in pre-industrial Europe, the birch trees were white. This permitted white moths to survive and not get eaten by the owls that hunt them, until the industrial revolution. Ash got on the birch trees, changing the color of the trees to a darker black. The white moths stood out, and therefore got eaten, permitting the black variant of the moths to thrive, where they were close to complete eradication before the revolution.
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how do i describe the second part of anaphase one the cell cycle? as in after the division of chromosomes.
loris [4]

Answer:

<h2><u><em>I think this will help u with the answer that ur looking for. I hope so</em></u></h2>

Explanation:

<h3><u><em>Anaphase is the fourth phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. Before anaphase begins, the replicated chromosomes, called sister chromatids, are aligned at along the equator of the cell on the equatorial plane. The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere. </em></u></h3><h3><u><em> </em></u></h3><h3><u><em>During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes. The chromosomes are separated by a structure called the mitotic spindle. The mitotic spindle is made of many long proteins called microtubules, which are attached to a chromosome at one end and to the pole of a cell at the other end. The sister chromatids are separated simultaneously at their centromeres. The separated chromosomes are then pulled by the spindle to opposite poles of the cell. </em></u></h3><h3><u><em> </em></u></h3><h3><u><em>Anaphase ensures that each daughter cell receives an identical set of chromosomes, and it is followed by the fifth and final phase of mitosis, known as telophase. </em></u></h3><h3><u><em> </em></u></h3>

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3 0
3 years ago
The Great White Shark is on its way to being endangered. Why? Cite your evidence to support your response.
Brilliant_brown [7]

well according to my memory and one of the save the earth communities, the great white shark is almost extinct cause of pollution, and mainly poachers, lots of poachers for soup made of shark fins.

they would cut off the fin then throw the dead shark back in the ocean.

i hope this helped.

☜(゚ヮ゚☜)(☞゚ヮ゚)☞

3 0
3 years ago
After eating a salty snack like potato chips, the cells in your mouth become saturated with salt. What happens to the cells in y
Minchanka [31]
I believe the answer is B
8 0
3 years ago
Read 2 more answers
Match the reactants and products with the correct HALF of PSN.
murzikaleks [220]

Answer:

B

Explanation:

3 0
3 years ago
Ent var
jok3333 [9.3K]

Answer: Oxygen

Explanation:I hope it helps . i have breifly explained it .

Oxygen gas is one of the products of photosynthesis.

Which reactant is the source for oxygen gas and how is it released?

A .

Water, released when sunlight splits it into oxygen and hydrogen ions

B .

Glucose, released when glucose is broken down into carbon dioxide gas, oxygen gas and water

C .

Carbon dioxide, released when sunlight splits it into carbon and oxygen gas

D .

Electrons, released when they strike the chloroplasts

Green plants capture energy and convert it into chemical energy by the process known as photosynthesis. During photosynthesis, carbon dioxide and water are transformed into simple carbohydrates and oxygen is liberated into the atmosphere.

light

6CO2 + 12H2O ----------------> C6H12O6 + 6O2

chlorophyll

Water is also used as a source of hydrogen required for reduction of carbon dioxide to form carbohydrate.

Water is oxidised in presence of light and chlorophyll. Hydrogen is removed from water and oxygen is released as follows:

light

4‎H20 ---------------> 2‎H20 + 4H+ + 4e− + O2

chlorophyll

or,  

2‎H2O ----------------> 4H+ + 4e− + O2

Hence the source for oxygen gas is water and it is released when water splits in the presence of sunlight into oxygen and hydrogen ions.

So, the correct answer is 'Water, released when sunlight splits it into oxygen and hydrogen ions'.

4 0
3 years ago
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