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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.
the process whereby nutrients that have been absorbed from the digestive system are taken up by...
can be broken down, in a reasonable amount of time, into its base compounds by micro-organisms...
a perforated wall or part of a wall at the end of one of the individual cells making up a sieve...
animals that lack a cavity between the digestive tract and the outer body wall.
a form of malnutrition caused by a severe shortage of protein in the diet.