Which era is known as the $Golden$ $Age$ of $Dinosaurs$ or the $Age$ of $Reptiles$?

As the horse evolved,there was a progressive reduction in the number of toes. Which of the following is the correct sequence in the evolution of the horse?

Dinosaurs originated in which era?

Which era is considered the $ \text{Golden Age of Dinosaurs} $?

The reptiles,like dinosaurs,were dominant in the . . . . . . period.

The rise of invertebrates occurred in which era?