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energy resources (coal, crude oil and natural gas) derived from the fossilised remains of plants and animals that died and were buried under sediments millions of years ago.
the process whereby a particular change causes a response which reverses that change.
a biological membrane that separates the interior of all cells from the outside environment.
a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...
a thick, sticky liquid in which all the other nuclear components are suspended.
allergic reaction to certain allergens such as pollen. It causes sneezing, a runny nose and...