Describe an experiment to show that `CO_2` is essential for photosynthesis.

Explanation

### Step-by-Step Solution to the Experiment Showing CO₂ is Essential for Photosynthesis

**Step 1: Preparation of Plants**
- Take two healthy potted plants of nearly the same size. This ensures that both plants have similar health and growth conditions.

**Hint:** Use plants that are known to perform photosynthesis effectively, such as a common houseplant.

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