Ancestral amphibians were tetrapods that evolved during

The biggest dinosaur had about $20$ feet height and huge, fearsome dagger-like teeth. The name of it is

The mammals evolved from the reptiles in the:

Ancestors of mammals belong to which group?

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 were abundant in