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section a
1 digestion
2 organ system
section b
1 . Internal respiration is the route of diffusing oxygen from the blood, into the interstitial fluid and the cells. Oxygen is exuded from blood cells in retort to the oxygen concentration in the capillaries of blood vessels, which is regularly really low.
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The basic processes of life include organization, metabolism, responsiveness, movements, and reproduction. In humans, who represent the most complex form of life, there are additional requirements such as growth, differentiation, respiration, digestion, and excretion.
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