Identify the figure given below:

Which among the following was the biggest land dinosaur?

An evolutionary trend in which there is general degeneration and loss of organs is known as:

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

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.

Two morphologically similar populations are intersterile. They belong to