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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Answer:
There are five types of placentation that occurs in flowering plants i.e. axile, marginal, parietal, basal, superficial placentation.
The lens used in a magnifying glass are called convex lens.
The type of math scientists use to analyze data is called statistics. It enables researchers to learn from numbers by measuring, controlling and communicating degrees of certainty and uncertainty, as explained by the American Statistical Association.
Hereditarily altered harvests may expand the dangers of unfavorably susceptible responses. Hereditary building is the way toward breaking the regular limits that exist between species to deliver new life frames that will create an assortment of fancied attributes. Hybridization is the preparation of the bloom of one animal varieties by the dust of another species-or counterfeit cross-fertilization
