A pair that correctly associates the mechanism for osmoregulation or nitrogen removal with the appropriate animal. is option  D. exchange across the body surface-snake.
Osmoregulation is the control of water degrees and mineral ions (salt) in the blood. Water tiers and mineral ions within the blood are controlled to keep the concentrations equal in the cells around them. this protects cells by way of stopping an excessive amount of water from getting into or leaving them by osmosis.
Osmolarity is an estimation of the osmolar attention of plasma and is proportional to the quantity of debris in keeping with liter of solution; its miles are expressed as mmol/L. this is what's used while a calculated cost is derived. it's miles derived from the measured Na+, okay+, urea, and glucose concentrations. Osmolarity is a measure of the variety of particles in a liter of liquid.
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