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two or more forms of a particular chemical element, that have the same number of protons in the nucleus but have different numbers of neutrons in the nucleus. The different possible versions of each element are called isotopes.
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...
sharp-edged modified last upper premolar and the first molar in carnivores adapted to shear or...
extremely small infectious particles that can only reproduce inside a host cell.
energy resources (coal, crude oil and natural gas) derived from the fossilised remains of plants...