From which phylum the closed circulatory starts ?
Dear Student,
Annelida is the first phylum to have closed circulatory system. Closed circulatory system has two advantages:
Regards
Annelida is the first phylum to have closed circulatory system. Closed circulatory system has two advantages:
- Mixing of pure and impure blood does not occur as they flow in different vessels.
- Efficiency of blood flow is increased as the blood pressure is higher in closed vessels.
Regards