Which of the following is correctly matched w.r.t. era and its period?
Paleozoic -Cretaceous
Mesozoic -Devonian
Cenozoic -Permian
Paleozoic -Carboniferous
First dinosaurs and first egg-laying mammals were originated in
Age of gymnosperm is
$A$ : Mesozoic is the era of dinosaurs but they suddenly disappeared from the earth.
$R$ : Dinosaurs may have changed into birds or climatic changes killed them
Golden age of reptiles is