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How many pairs of heart are present in t...

How many pairs of heart are present in the earthworm?

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### Step-by-Step Solution: 1. **Identify the Organism**: The question asks about the number of heart pairs in an earthworm. Earthworms belong to the phylum Annelida. 2. **Understand the Circulatory System**: Earthworms have a closed circulatory system, which is different from many other lower invertebrates that typically have an open circulatory system. 3. **Clarify the Term 'Heart'**: In the case of earthworms, they do not possess a true heart like vertebrates. Instead, the term "heart" refers to structures known as aortic arches. ...
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