During which geological period did the dinosaurs originate?

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

The $Jurassic$ period of the $Mesozoic$ era is characterized by:

The mammals evolved from the reptiles in the:

The $ \text{Golden Age of Fishes} $ is known as:

Which of the following organisms were lobe-finned fishes that evolved into the first amphibians?