Boa constrictors and pythons lack external limbs but their skeletons reveal bones of tiny hindlimbs. What structure is represented in this example

Marianne is comparing two animals: a fruit fly and a fruit bat. she asks, "do a fruit fly and a fruit bat share a common ancestor in their evolutionary history? " according to evolutionary theory, what is the answer to marianne's question?

The distribution of related animals and plants across the world

Explain how organisms could be harmed by high levels of salt from roadways?