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hierarchy of life from the smallest to largest unit
organelle, cell, tissue, organs, organ system, organism
Water
used in many metabolic processes, provides the environment for metabolic reactions, and carries substances.
Food
supplies energy, raw materials for building new living matter, and chemicals necessary in vital reactions.
Oxygen
used to release energy from food materials. This energy drives metabolic reactions.
Heat
a product of metabolic reactions and helps govern the rates of these reactions.
Pressure
an application of force to something. In humans, atmospheric and hydrostatic pressures help breathing and blood movements, respectively.