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not under our conscious control.
a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva...
energy resources such as coal and oil, which are being used up much more quickly than they can...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
self-feeding; makes its own food by the process of photosynthesis.
when an animal accumulates body fat or stores food resources during warmer periods and becomes...