Question

1. why must we consume other organisms? 2) why do we have to inhale and exhale? what gases are involved in these processes?

Explanation:

1. Living organisms need energy and nutrients for growth, repair, and maintenance of life - processes. Autotrophs can produce their own food, but heterotrophs must consume other organisms to obtain these essential substances.
2. Inhalation and exhalation are part of the respiratory process. We inhale oxygen which is used in cellular respiration to produce energy. We exhale carbon - dioxide, a waste product of cellular respiration.

Answer:

1. We must consume other organisms to obtain energy and nutrients for life - processes as heterotrophs.
2. We inhale to get oxygen for cellular respiration and exhale to release carbon - dioxide, a waste product of cellular respiration.