Does a hydra respire or breathe or breathe as well as respire or does not respire at all?

Explanation

### Step-by-Step Solution

1. **Understanding Breathing vs. Respiration**:
- Breathing is a voluntary process involving the inhalation of oxygen and exhalation of carbon dioxide, which requires specialized organs like lungs and a windpipe.
- Respiration, on the other hand, is a biochemical process where organisms utilize oxygen to break down food and release energy (ATP).

2. **Hydra's Anatomy**:
- Hydra is a simple aquatic organism that lacks specialized respiratory organs such as lungs or a windpipe.
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