Answer:
they give the lungs a really big surface area. they have moist, thin walls (just one cell thick) they have a lot of tiny blood vessels called capillaries.
The walls of the alveoli are only one cell thick. This makes the exchange surface very thin - shortening the diffusion distance across which gases have to move. Each alveolus is surrounded by blood capillaries which ensure a good blood supply.Adaptations of the alveoli:
Thin walls - alveolar walls are one cell thick providing gases with a short diffusion distance. Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface. Permeable walls - allow gases to pass through.
Explanation:
Have great day
Answer:
B
Explanation:
the constant in biology does not change during an experiment. it is also called the controlled. think of it the same as algebra.
Answer:
B
Explanation:
In summary,macromolecules are <u>large</u><u> </u> molecules and there are <u>five</u><u> </u><u> </u> types of them.
Use 4 eggs. Put one egg in warm water and one egg in cold for trial one. Do another trial doing the same thing with the other eggs. See which gender the animal is after performing this and providing a recovery period.
(A. it can alter precipitation patterns)
