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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