The first mammals appeared in which geological period?

Which organisms were dominant during the Mesozoic era?

The rate of appearance of new life forms is linked to their

Match List-$I$ with List-$II$ with respect to the chronology of the evolution of life forms:

List-$I$	List-$II$
$A$. About $65 \text{ mya}$	$I$. Jawless fish probably evolved
$B$. About $500 \text{ mya}$	$II$. The dinosaurs suddenly disappeared from the earth
$C$. About $350 \text{ mya}$	$III$. Seaweeds and few plants probably existed
$D$. About $320 \text{ mya}$	$IV$. Invertebrates were formed and became active

Choose the correct answer from the options given below:

How many periods are there in the Cenozoic era?

Provide a brief account of the history of evolution.