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Annelids/Roundworms are the first animal...

Annelids/Roundworms are the first animals to have blood vascular system.

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To determine whether Annelids or Roundworms are the first animals to have a blood vascular system, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Blood Vascular System**: - A blood vascular system consists of a network of vessels (arteries and veins) that transport blood throughout the body, delivering oxygen and nutrients to tissues and removing waste products. 2. **Identifying Annelids**: ...
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