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(also called a glacial age) a long period of low temperature on Earth, during which large sheets of ice form as glaciers and as ice masses at the poles.
is the supply of materials, in the form of food, required by organisms and cells to stay alive...
the instrument that measures the volume of air entering and leaving the lungs.
substances that have a harmful effect on the environment and also on human health.
the kingdom of multicellular organisms that contain chlorophyll and make their own food by...