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the formation of a relatively complex chemical compound from simpler substances.
when a person uses their breath to help another person who has stopped breathing, in an attempt...
(also called secondary meristems) regions of cells capable of dividing to form new cells in the...
a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
an infection of the skin, caused by a parasitic mould. It causes small, red itchy circles on the...