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a sudden severe instance of abnormal heart function accompanied by chest pains and possible death.
the spread of cancer cells from the original (primary) malignant tumour to other parts of the...
the body system concerned with the digestion and absorption of nutrients.
the flooding of land, such as the flooding that happens when dams are constructed.
all the different ecosystems with their numerous and varied organisms.
mechanical process whereby air enters and leaves the lungs.