Which of the following have strong grinding teeth?

Which one of the following have strong muscles and a flexible backbone?

How do the plates act when the snakes move?

What helps the frog to swim?

Humans have a pair of limbs called:

Birds like the purple moorhen and the pelican are local migratory birds of:

How do amoeba breath through?

Which of the following from the air passes into the blood and carbondioxide from the blood passes into the air?

How do penguins use their forelimbs as?

Which fin helps to change the direction of movement?