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a statement that is true for all values of a variable.
forms between two atoms if the two atoms share six electrons.
animals with three cellular body wall layers: the ectoderm, mesoderm and endoderm.
a rhythmic foot consisting of a stressed syllable followed by an unstressed syllable, e.g. There...
a rhythmic foot consisting of a stressed syllable followed by an unstressed syllable, e.g. There...
the part of the atmosphere that extends to a height of 10 km above the surface of the Earth.