Which of the following statements about the movement of oxygen and carbon dioxide in complex multicellular organisms is true?

A. Their movement by diffusion into and out
of cells is limited to just a few layers of cells.
B. They are moved into and out of cells by
specific transport proteins.
C. Bulk transport systems are required in
macroscopic organisms to facilitate the
transport of carbon dioxide and oxygen.


A

Biology & Microbiology

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