Q: What is needed to provide cells with the oxygen they need for cellular respiration?


Read this paragraph and choose the correct option from the provided answers:

Gas exchange is needed to provide cells with the oxygen they need for cellular respiration. Cells cannot survive for long without oxygen. Gas exchange is also needed to carry away carbon dioxide waste. Some of the carbon dioxide in the blood dissolves to form carbonic acid, which keeps blood pH within a normal range.

 Choices:

- vascular tissue

- passive transport

- photosynthesis

- gas exchange


A:
gas exchange