List out the characteristic features of protochordates.

Explanation

### Step-by-Step Text Solution:

1. **Habitat**: Protochordates are primarily found in marine (salty) waters. This means they inhabit oceans and seas.

2. **Body Symmetry**: They exhibit bilateral symmetry, which means their body can be divided into two identical halves along one plane.

3. **Tissue Layers**: Protochordates are triploblastic, indicating that their bodies are made up of three primary germ layers: ectoderm, mesoderm, and endoderm.

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