What is breathing and respiration?​

BREATHING:

Breathing is the process of moving air out in the lungs to facilitate gas exchange with the internal environment,mostly to flush out carbon dioxide and bring in oxygen.

RESPIRATION:

In physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, and the removal of carbon dioxide in the opposite direction.

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answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.