The wall of the capillaries and the alveoli are very thin. why do they need to be thin?

Approximately what wavelength of light is best absorbed by chlorophyll a

Animals that have thick fur and ae able to store large amounts of body fat live where ?

The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?