Question

1. what gas do humans (and other animals) make and then breathe out?

a. oxygen
d. glucose
b. hydrogen
c. carbon dioxide

Explanation:

During cellular respiration, humans (and other animals) consume oxygen and glucose to produce energy. One of the by - products of this process is carbon dioxide, which is then exhaled. Oxygen is inhaled, hydrogen is not a gas that is prominently involved in this exhalation process in the context of the question, and glucose is a sugar (not a gas).

Answer:

C. Carbon Dioxide