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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.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
a response of the body tissues to injury or irritation. It causes pain, swelling, redness and...
a muscle, gland or organ capable of responding to a nerve impulse in order to bring about a...
a system of support in soft-bodied animals, which relies on pressure of fluids in the body...