Metabolism:
All the chemical reactions taking place within a cell are collectively called metabolism. Metabolic processes are characterized as anabolism and catabolism.
Anabolism:
Those reactions in which simpler substances are combined to form complex substances are called anabolic reactions. Anabolic reactions need energy.
Catabolism:
Those reactions in which complex molecules are broken down into simpler ones are called catabolic reactions. Catabolic reactions release energy.
Water:
Water is the medium of life. It is the most abundant compound in all organisms. It varies from 65 to 89 percent in different organisms.
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