Question

The diagram below represents the inputs and outputs of cellular respiration. The arrows entering the cell are inputs. The arrows exiting the cell are outputs.

Complete the diagram by adding the missing input and output.
sunlight
oxygen
carbon dioxide
methane

Answer 1

In cellular respiration, the main inputs and outputs are as follows:

**Inputs:**
1. Glucose (which can be derived from food)
2. Oxygen

**Outputs:**
1. Carbon Dioxide
2. Water (H₂O)
3. ATP (energy)

Based on your options (sunlight, oxygen, carbon dioxide, methane), we should correctly fill the inputs and outputs of cellular respiration.

**Missing Input:**
- Oxygen (since it is needed for aerobic respiration)

**Missing Output:**
- Carbon Dioxide (as it is released during the process of cellular respiration)

Therefore, in your diagram, you would add **oxygen** as an input and **carbon dioxide** as an output.

Sunlight is typically associated with photosynthesis, not cellular respiration, and methane is a byproduct of certain anaerobic processes, which is not a direct output of cellular respiration.