Answer:
flippers in seals and sea lions, snakes on snake island
Explanation: seals and sea lions used to be bears that were forced into the aquatic biome to survive and slowly evolved to become the modern day seal or sea lion and the powerful venom of the sankes in snake island who have more potent venom than the snakes on the mainland because the only prey they have is birds that can be captured without the powerful venom which they gained through evolution hope this helps god bless