Answer:
it is a cell membrane (d)
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Answer:
A. increases by a factor of 3
Explanation:
Breathing is an automatic and rhythmic act produced by networks of neurons in the hindbrain (the pons and medulla). The neural networks direct muscles that form the walls of the thorax and abdomen and produce pressure gradients that move air into and out of the lungs.
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These are all digestive enzymes.
