What type of body plan do the following animals have : hydra, sponge, flatworms, roundworms, jellyfish, earthworm, spiders, sea horse, frog, sparrow?

Explanation

To determine the type of body plan for each of the listed animals, we can categorize them based on their anatomical structures. Here’s a step-by-step breakdown:

### Step 1: Identify the Body Plans
1. **Cell Aggregated Body Plan**: This body plan is characterized by cells that are grouped together but not organized into tissues or organs.
- **Example**: Sponge

2. **Blind Sac Body Plan**: This body plan has a single opening that serves as both the mouth and the anus. This means that food enters and waste exits through the same opening.
- **Examples**: Hydra, Flatworms, Jellyfish
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