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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Sand is more Permeable. It is the smallest, and can diffuse the easiest over a membrane.
Answer:
The right ans is option A ...It helps in the tranfer of minerals from the soil to plant
Of poor water hygiene and management
Answer:
oot systems are mainly of two types (Figure 1). ... Dandelions are a good example; their tap roots usually break off when trying to ... The outermost cell layer of the root's vascular tissue is the pericycle, an area that can give rise to lateral roots
Explanation:
