........ is the largest land reptile.

Scientists believe that evolution is gradual. However,extinction,which is a part of the evolutionary story,is often 'sudden' and 'abrupt' and also group-specific. Comment on whether a natural disaster can be the cause of the extinction of species.

From which ancestral groups did birds and mammals evolve?

Which of the following refer to correct example$(s)$ of organisms which have evolved due to changes in environment brought about by anthropogenic action?

Darwinian theory was unable to explain:

Select the incorrect statement.