The biggest dinosaur had about $20$ feet height and huge, fearsome dagger-like teeth. The name of it is

Present day mammals have their predecessor in

Select the option that shows the correct sequence of plant evolution.
$(I)$ Chlorophyte ancestors
$(II)$ Rhynia-type plants
$(III)$ Psilophyton
$(IV)$ Tracheophyte ancestors

The $Cenozoic$ era is known as:

The $Mesozoic$ era of the Earth is known as the:

The first mammals arose: