The answer is b. is under purifying selection
Answer:
ice age/ Quaternary glaciation
Explanation:
Ice ages have occurred in the earth history and do occur more or less regularly in a cycle. It is believed that ice ages are as a result of small changes in the earth's orbit and also dependent on the solar cycles. The temperatures on the earth reduce causing the ice sheets in the poles to extend to the subtropics.
Answer:
For early earth, it was filled with loads of oxygen and could kill humans if they breathed the oxygen that was in the air about 100 million years ago. This massive amount of oxygen cause massive creatures like the dinosaurs to exist. Current earth has an atmosphere with not too much oxygen.
Explanation:
brainliest
Explanation:
Carbon dioxide and other greenhouse gases in the atmosphere prevents long wave radiation from leaving the earth and in the process, it raises global temperatures.
- Greenhouse gases helps to maintain the fair balance in temperature on the earth surface.
- They keep the temperature of the earth in balance by preventing it from losing all of the heat it gains.
- Radiation from the sun reaches the surface as short wave radiations.
- When they get absorbed and re-emitted, they produce long wave thermal radiations.
- In the atmosphere, the radiations are cut off and causes warming due to their interaction with greenhouse gasses there
- When the amount of these gases in the atmosphere become more than normal, more heat becomes trapped.
- This leads to an anomalously high surface temperature on earth.
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The fern should be found on the west side of the mountain ranges at higher elevations because the prevailing winds are from the west off the Pacific Ocean so bring moisture in the clouds and as the clouds rise up over the westernmost mountains they cool off and precipitate so in the warm seasons rain would be concentrated in this area and higher up would be cooler.
