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:
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some one celled organisms reproduces by binary fission which is a process of cell division. The answer is 4.
<span>(3) It cannot perform metabolic processes.</span>
A habitat<span> is an ecological or </span>environmental<span> area which is inhabited by particular species of animals, plants, or other type of organism.
</span><span>Environmental factors that create different habitats include:
temperature
topography
growing seasons
animals
plants</span>
