Question

What is one key event from the Mesozoic Era?

O All sea life disappeared.
O Humans first appeared.
O Dinosaurs first appeared.
O All mammals became extinct.

Answer 1

the answer option is dinosaurs first appeared

Answer 2

C. Dinosaurs first appeared.

Step-by-step explanation:

One key event from the Mesozoic Era is the appearance of dinosaurs. According to Britannica1, dinosaurs first appeared during the Mesozoic Era, which began 252.2 million years ago and ended 66 million years ago12. Dinosaurs became the dominant terrestrial vertebrates in the Late Triassic or Early Jurassic, occupying this position for about 150 or 135 million years until their demise at the end of the Cretaceous2. Therefore, the correct answer to your question is: