Explanation:
Because these are the living technology of earth.
The reason that plants tend to have larger leaves on the forest floor is because the leaves need to capture more sun.
By increasing the surface area of the leaf, which also increases the amount of sun it collects, it can compete with the larger trees and vines when it is exposed to less sun due to said trees.
Gill are typically outgrowths of tissue or clustered strands of filaments.
Any organ (in aquatic animals) that exchanges gases and other dissolved substances between the blood and surrounding water have typically outgrowths of tissues or clustered strands of filaments called gill. In a fish, gill filaments are present.
Diffusion vs. Active Transport: molecules move across cell membranes by two major processes diffusion or active transport. Diffusion is the movement from a high concentration of molecules to a low concentration of molecules. ... Moving molecules with cell energy is called active transport
Their surface area-to-volume ratio.
Cells are so small so the surface area and volume of them can be proportional to each other. This helps with the efficiency of the cell's absorption and waste expulsion processes. Also by the cell's smallness, communication from the nucleus to other organelles is fast and the cell can be regulated while the conditions for diffusion are still ideal.