First dinosaurs and first egg-laying mammals originated in which period?

What is the name of the animal shown in the figure?

Which of the following options provides a correct example of convergent and divergent evolution,respectively? (Convergent Evolution - Divergent Evolution)

Assertion $A$: Organisms show variations to adapt and utilize the environment to the maximum extent.
Reason $R$: Variations lead to the formation of new species.
Which option is correct for Assertion $A$ and Reason $R$?

What is common between whales,seals,and sharks?

The evolutionary history of a particular group of organisms is called