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the body system concerned with the digestion and absorption of nutrients.
a solution to which a little acid has been added to a lot of water.
a solution to which a little base has been added to a lot of water.
marginal utility drops with each additional unit of the product consumed.
meaning small; used to denote smallness, affection or triviality, e.g. duckling, mommy, Johnny,...
meaning small; used to denote smallness, affection or triviality, e.g. duckling, mommy, Johnny,...
single-celled algae that have two flagella and are found mainly in seawater but are also common...
animals with two cellular body wall layers: the ectoderm and endoderm.