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:

Step1: Understand energy - need in organisms

All organisms need energy for life - processes like growth, repair, and movement. They cannot produce all the energy and nutrients they need on their own.

Step2: Energy - transfer in food - chain

By consuming other organisms, they obtain the energy stored in the organic molecules of those organisms. For example, herbivores eat plants to get the energy plants have stored through photosynthesis.

Step3: Respiration process

Inhalation and exhalation are part of the respiration process. We inhale oxygen ($O_2$) which is used in cellular respiration to break down glucose ($C_6H_{12}O_6$) and release energy in the form of ATP. The chemical equation for cellular respiration is $C_6H_{12}O_6 + 6O_2
ightarrow6CO_2 + 6H_2O+$ energy. We exhale carbon - dioxide ($CO_2$) and water vapor ($H_2O$) which are the by - products of this process.

Answer:

1. We must consume other organisms to obtain energy and nutrients that our bodies cannot produce on their own.
2. We inhale oxygen to use in cellular respiration for energy production and exhale carbon - dioxide and water vapor which are the by - products of cellular respiration. The gases involved are oxygen during inhalation and carbon - dioxide and water vapor during exhalation.