Cyclostomes have a closed circulatory system, live in marine environments but migrate to freshwater to spawn, dying shortly after, and their larvae metamorphose before returning to the ocean.
Circulation is of closed type. Cyclostomes are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean.
| Text | Circulation is of closed type. Cyclostomes are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean. |
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