Question 3: Most aquatic animals, like fish, penguins, and whales all have streamlined bodies and fins or flippers for steering, even though they are not closely related to each other. This is an example of convergent evolution, analogous selection, divergent evolution, or sexual selection.
Question 4: If a structure has no apparent function in one species, yet is homologous to a functional organ in another species, this structure is called analogous, homozygous, homologous, or vestigial.
Question 5: The differences between human cytochrome c (a protein) and the same protein in other species are as follows: Rhesus monkey: 1 difference; Pigeon: 12 differences; Fruit fly: 24 differences. What can we infer from this information? That humans and rhesus monkeys have a more recent common ancestor than humans and pigeons. That Rhesus monkeys are more closely related to humans than to pigeons or fruit flies. That fruit flies are more distantly related to humans than pigeons. All of these answers are correct.