How are chordates different from non-chordates on the basis of heart?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Chordates and Non-Chordates**:
- Chordates are animals that possess a notochord at some stage of their life cycle, along with other characteristics such as a dorsal nerve cord and pharyngeal slits.
- Non-chordates are animals that do not have these features, including a notochord or a dorsal nerve cord.

2. **Heart Placement in Chordates**:
- In chordates, the heart is typically located ventrally (on the underside of the body). This means that the heart is situated towards the belly side of the organism.
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