a cell is the smallest structural and functional unit of an organism
Answer:
Troposphere.
Explanation:
Humans live most of their lives in the troposphere atmosphere.
Answer:
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When oxygen is absent, anaerobic respiration occurs ('an' means without).
Answer:
Explanation:A mechanical wave requires an initial energy input. Once this initial energy is added, the wave travels through the medium until all its energy is transferred. In contrast, electromagnetic waves require no medium, but can still travel through one.
