Humans, chimpanzees, whales, and bats all have the same bones in their arms, fins, or wings. This is an example of a

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Explanation:

Humans, chimpanzees, whales, and bats all have the same bones in their arms, fins, or wings. b. Why is this evidence of evolution? This is evidence of evolution because if all these animals have the same bones, they probably all evolved from one creature that had those bones a very long time ago.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.