The genetic change in a population or species over many generations is
1. gene flow 2. genetic drift 3. evolution 4. natural selection

A: gene flow

Explanation:

I can not really explain it i just have this hunch let me know.

The answer is 2- genetic drift

Explanation:

In contrast, genetic drift produces random changes in the frequency of traits in a population

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

answer; i believe the correct answer is (anemia);