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epithelial tissue consisting of a single layer of cells.
mass extinction event of 65 million years ago, in which about 85% of all species on Earth died...
the actions of the body's immune system that work to fight infections or disease.
process by which cells become specialised to perform a specific function.
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...
undifferentiated cells found in almost all organisms that have the ability to develop into any...