The front limbs and the back limbs are respectively called as:

The tail fin helps them to change .

What do herbivores have to use travel long distance in search of plants ?

The earth is surrounded by a layer of air called 

Fish take in:

Mammals breath through

Insects breath through .

When in water a frog  breathes through its moist?

The gas exhaled is.

Turtles have paddle shaped feet called .