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the spread of cancer cells from the original (primary) malignant tumour to other parts of the body where new tumours develop.
animals with two cellular body wall layers: the ectoderm and endoderm.
compounds that consist of any combination of elements, but do not usually contain carbon and...
the clear colourless fluid that occurs in the spaces, such as the ventricles and central canal,...
an injection of a weakened or dead pathogen into the body to build up immunity against a disease...