Because their bodies tell them that they need more oxygen and so breathe faster, and try and get the oxygen their body requires and depends on.
The answer to your question is A. Higher latitudes receive less radiation due to the curvature of the Earth.
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Velocity can vary as long there is specific direction (displacement)
Speed has no direction therefore change in speed is not necessary the velocity...
Velocity is also in a specified direction
Fungi break down dead matter while detritivores consume it.
