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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 bone-like substance beneath the enamel of the tooth.
(also called primary meristems) meristems at the apex (tip) of stems and roots where primary...
irreversible disease where the alveoli are damaged, resulting in breathing difficulties.
produced when the liver breaks down old red blood cells
large spongy organs in which gaseous exchange takes place in vertebrates (with the exception of...