Question

one reason indoor environments are sometimes perceived to be less healthy than outdoor environments is that the level of carbon dioxide is slightly elevated indoors. complete the following passage about indoor environments.
the atmospheric composition indoors is likely due to the human process of cellular . one way people sometimes combat this trend is by having indoor plants. these plants increase the concentration of in the atmosphere by carrying out the metabolic process of .
metabolism respiration photosynthesis carbon dioxide oxygen catabolism nitrogen

Explanation:

Cellular respiration in humans consumes oxygen and releases carbon - dioxide, increasing indoor CO₂ levels. Indoor plants perform photosynthesis, which uses carbon - dioxide and releases oxygen, thus increasing oxygen concentration.

Answer:

The first blank: respiration
The second blank: oxygen
The third blank: photosynthesis