How do plants and animal survive in water?
Answers
An aquatic animal is an animal, either vertebrate or invertebrate, which lives in water for most or all of its life.[1] It may breathe air or extract its oxygen from that dissolved in water through specialised organs called gills, or directly through its skin. Natural environmentsand the animals that live in them can be categorized as aquatic (water) or terrestrial (land).
The term aquatic can in theory be applied to animals that live in either fresh water (fresh water animals) or salt water (marine animals). However, the adjective marine is most commonly used for animals that live in saltwater, i.e. in oceans, seas, etc.
Aquatic animals (especially freshwater animals) are often of special concern to conservationists because of the fragility of their environments. Aquatic animals are subject to pressure from overfishing, destructive fishing, marine pollution and climate change