Which property supports the hypothesis that eukaryotic mitochondria were once prokaryoticorganisms?

Which pattern most likely came from a gunshot and which one was produced from a blow on the head? explain your answer?

If the birth rate of a population of dolphins is 2.0, the death rate is 0.5, and the population size is 100, what is this dolphin's population growth?

What function does the limb sever in each animal? how are the limb bones of the four animals similar? based on these similarities what can be inferred about the evolution of the four animals.