Which organisms were dominant during the Mesozoic era?

In which period did the first flowering plants (angiosperms) evolve?

The origin of mammal-like reptiles occurred in which period?

Trilobites were evolved during which of the following periods?

Which era is also known as the 'Age of Reptiles'?

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