True, A leaf can exchange gases through tiny openings called stomata., After running, we breathe faster because our body needs more oxygen., Alveoli are tiny air sacs where oxygen moves into the blood., Clean air is important because it helps our body get enough oxygen., If a pond is polluted, fish may have difficulty getting oxygen., False, Fish can live on land for a long time because they have gills., Humans take in carbon dioxide and breathe out oxygen., A fish uses stomata to exchange gases.

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