1) Tell how tge forelimbs of a bat, a whale,a cat, andd a human contribute evidence to supporr the hypotgesisthat these mammals evolved from a common ancestor.

2) Explain how the effectiveness of an antibioticdecreases with time.

3) Pesticedes have created pesticide-resistant insects.

4) Two populations of mice living on pposite sides of a riverare separate species. lightweight bones evolved in birds so the birds couldfly.