Most of the available energy is used for three things: Respiration, Movement, and Reproduction.
Trophic level of an organism refers to the position of the organism in the flow of energy in an ecosystem.
Organisms feed on one another in an ecosystem to obtain energy needed for their metabolic activities.
More energy is contained in lower trophic levels than that of higher trophic levels.
Thus, energy is used for three things: Respiration, Movement, and Reproduction.
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