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a hormone produced by the adrenal glands which helps to maintain the balance of sodium in the blood and tissue fluid.
competition between organisms of different species.
the process whereby substances dissolved in the blood (such as H+ ions, nitrogenous waste and...
responsible, low impact, usually small- scale travel to protected, unspoilt, natural areas and...
a tough substance made from a modified polysaccharide that contains nitrogen. It is the main...
the inner body tissue layer that forms the gut and other internal organs.