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a group of organic compounds obtained by oxidation of alcohols.
a hormone produced by the adrenal glands which helps to maintain the balance of sodium in the...
plant-like organisms that live and grow in water; they make their own organic food by the...
the excessive growth of algae in eutrophic streams, rivers and dams.
an expression consisting of one or more algebraic terms.
a species that has been introduced into an area in which it did not previously or naturally...
the digestive tract of an animal, made up of different organs, that extends from the mouth to...
a group of very reactive chemical elements that readily lose their one valence electron to form...