The Stages of Evolution of Animals

Give reasons for the following:

The species of dinosaurs, which were enormous in size, suddenly became extinct.

Give reasons for the following:

In the course of time, a new species with characteristics different from the original species is created.

Fill in the blanks in the concept chart given below.

Fill in the blank.
___________ are the most evolved animals among vertebrates

Answer the question in one sentence.
What do we call animals which live in water and also on land?

Answer the question in one sentence.
Where did the first humans appear?