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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.
the domain that contains prokaryotic micro-organisms. Some live in extreme environments, such as...
the condition caused by a severe shortage of both energy and nutrients in the diet over an...
gas consisting mainly of methane and carbon dioxide, which is produced as a result of...
the factor in an investigation that is under the control of the investigator.
primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought...