Reptiles were dominant during which of the following periods?

Match the following geological eras in Column $A$ with their respective time periods in Column $B$ and key evolutionary events in Column $C$. Which of the following is the correct match?

Column $A$	Column $B$ and $C$
$i$. Cenozoic	$2-65 \ \text{mya}$,Origin of vertebrates
$ii$. Palaeozoic	$500-165 \ \text{mya}$,Rise of egg-laying mammals
$iii$. Mesozoic	$135-225 \ \text{mya}$,Reptiles dominant
$iv$. Proterozoic	$350-500 \ \text{mya}$,Trilobites dominant

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

The earliest fossil in the evolutionary history of the horse is......

Match the following columns:

Column-$I$ (Organism)	Column-$II$ (Origin)
$P$. Invertebrates	$I$. $500$ million years ago
$Q$. Jawless fish	$II$. $350$ million years ago
$R$. Sea weeds and few plants	$III$. $320$ million years ago

Identify the organism based on the following characteristics:
- They were land reptiles.
- They had huge, fearsome, dagger-like teeth.