Clean air helps animals by supplying them with healthy, fresh oxygen to breathe. It's just like asking why we wash in clean water. It is obviously better than washing in the garbage truck. ;) Hope I answered your question correctly!
food clean air and sometimes animals prey only eats plants so it helps them still have a meal
we can help clean the oil spill by volunteering to help clean the animals who have oil on them.
carrot
The tiny hairs in our nose clean the dust particles in the air
The Clean Water Act and the Clean Air Act were created to help clean up the air and water from pollution. The Clean Air Act was passed in 1970 and the Clean Water Act followed in 1972.
trees help clean the air
Clean it
The tongues of giraffe helps it to clean its ears.
Animals can stay clean by having a bath not to often but not to less. Also being warmed often will help them to stay clean as worms make them dirty.
They clean the air so that we can breathe fresh air.
Cilia .
some fish like octupuses clean the ground. they eat the stuff on the ground.