The base of the Mesozoic is established by what major event in the history of life on Earth?
- A mass extinction 251 million years ago
- The formation of a super-continent
- An increase in biodiversity
- None of these
Answer
The correct answer is A) A mass extinction 251 million years ago.
More History questions
- What super-continent began to rift apart during the Mesozoic era?
- What marine reptiles evolved during the Triassic period and thrived during much of the Mesozoic era?
- Which of the following describes the climate of the Triassic period?
- Which of the following was a large inland sea that covered much of central North America during the Late Cretaceous period?
- What event signalled the end of the Mesozoic era?
- Dinosaurs first evolved during the middle Triassic period approximately how many years ago?