Capillaries are blood vessels that * A.) deliver blood to the cells of the body

B.) contain striated muscle

C.) carry blood toward the heart

D.) readily exchange materials between the blood and body cells

Where is having brightly colored feathers that attract mates most clearly an adaptation for a bird? a. a forest with dense vegetation b. a sandy beach beside an ocean c. a snowy tundra with little vegetation d. a swamp with many hawks that eat birds