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the process whereby certain substances are removed from a liquid and others retained, due to differences in their ability to pass through a semi-permeable membrane. Kidney dialysis is the medical procedure whereby a person's blood can be purified by passing it through a dialysis machine.
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...
when a person uses their breath to help another person who has stopped breathing, in an attempt...
the spread of cancer cells from the original (primary) malignant tumour to other parts of the...
self-feeding; makes its own food by the process of photosynthesis.
a system of support in soft-bodied animals, which relies on pressure of fluids in the body...