Distinguish between the following.
Protochordates and vertebrates

Explanation

To distinguish between protocordates and vertebrates, we can look at several key characteristics:

### Step-by-Step Solution:

1. **Definition**:
- **Protochordates**: These are the simplest chordates that possess a notochord, which is a flexible rod-like structure that provides support. They include organisms such as tunicates and lancelets.
- **Vertebrates**: These are more complex chordates that have a backbone or vertebral column. Vertebrates include animals such as fish, amphibians, reptiles, birds, and mammals.

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