In which era did mammals and birds evolve?

Which of the following was a land dinosaur?

$A$: $Tyrannosaurus$ $rex$ had fearsome dagger-like teeth.
$R$: $Tyrannosaurus$ was the largest dinosaur depending upon herbs and shrubs.

From which organism did the Gnetales evolve?

In a bush pattern of evolution,the uppermost tips of the branches represent

The earliest fossil form in the phylogeny of horse is: