Question

how is the carbon dioxide in air replaced​

Answer 1

Answer:

Oxygen is replaced in the atmosphere by the plants as they prepare food (photosynthesis). Carbon dioxide is replaced by the animals for the plants to consume.

Gas Exchange Between Alveolar Spaces and Capillaries

The function of the respiratory system is to move two gases: oxygen and carbon dioxide. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.

Answer 2

Answer:

carbon dioxide is given as a result of burning. air is present in a dissolved state in water.