Which statement about fossils could be used as evidence that evolution by natural selection has been in effect for
millions of years?

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.

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions

24. how are vaccines used to keep people healthy?