Give a description of the living conditions in the aquatic environment. Analyze the appearance of different animals

Give a description of the living conditions in the aquatic environment. Analyze the appearance of different animals living in the aquatic environment. What do they have in common?

The temperature here changes less than the air temperature. But oxygen is often not enough. Less light. The most noticeable feature of many aquatic animals is their swimming facilities. Fish, dolphins and whales have fins. Walruses and seals have flippers. Beavers, otters, waterfowl and frogs have webbing between the toes. Swimming beetles have swimming legs similar to oars.