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a method of ordering the age of different fossils, relative to each other, without working out their actual age.
the end part of the digestive system that consists of the caecum, colon, rectum and anus.
a form of asexual reproduction. It is an unequal cell division, in which a small cell forms...
single-celled organisms with all life functions performed within the cell.
structure surrounding plan tcells i tgives cells rigidity and strength.
an artificial device that helps to stimulate and regulate the heart muscle.