Which statement gives an example that best demonstrates how the geosphere has affected the evolution of life on Earth?

A.

Certain plants have evolved to absorb pollutants like carbon monoxide and formaldehyde through their leaves.

B.

Certain marine mammals have lost functioning hindlimbs, which can impede an animal's movement through water.

C.

Some hummingbirds have evolved to have very long beaks that can only reach the nectar of specific flowers.

D.

Some spiders that live in caves have lost functioning eyes, which are unnecessary in an environment without light.

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Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed