Cyclostomes have closed circulation, are marine, but migrate to freshwater for spawning, after which they die. Their larvae return to the ocean after metamorphosis.
Cyclostomes have closed circulation, are marine, but migrate to freshwater for spawning, after which they die. Their larvae return to the ocean after metamorphosis.
| 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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