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One of the threadlike processes forming the respiratory surface of a gill.
Answer:
I do! But I have not used s.n.a.p.c.h.a.t in like a year lol!
Multi cellular organism is an organism that consists of many cells unlike unicellular which consists of a single cell.
The first picture is of multicellular organisms.
The second, for more information, is of unicellular organisms
Answer - It defines how much a cell can do metabolic exchange and chemical substance exchange.
Reasoning - A Cell that is large has the ability of inadequate to provide the cell its nutrients and metabolic needs for the exchange in chemical substances.
Whereas a small cell does not take up space and can exchange quicker with chemical substance and nutrients because of its size to the surface area.