A. lack of exercise it makes the most sense
The answer would be Biology.
Answer:
We breathe in air which has a higher concentration of oxygen than carbon dioxide and we breathe out air with a higher concentration of carbon dioxide. Both the gases are present in the inhaled and the exhaled air.
Answer:
ethnocentrism
Explanation:
ethnocentrism is judging other ethnic group, culture, tribe or race based on perception