Answer:
Cost : The expenditure incurred by a producer on the factor as well as non-factor inputs for a given amount of output of a commodity.
Cells are simply the basic units from which living things are made of, some are single cell organisms while others could be made of thousands, millions or billions of cells.
Metabolism refers to the sum total of chemical reactions that take place usually, but not by any means always, inside cells e.g they could also occur in the blood plasma or in inter-cellular spaces. They are indispensable for sustaining life.
Peristalsis is involuntary constriction and relaxation of the intestine or another canal, it’s causes wave-like movements that push the contents of the canal forward.
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The breathing process occurs as follows: Inhalation increases the volume of the lungs, which reduces internal pressure and causes air to enter. Then the exhalation makes the opposite process. Gaseous exchanges occur in the lung alveoli and are responsible for eliminating the gases we do not need and preparing the oxygen to be spread throughout the body.
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