Question

question 14
1 pts
the dinosaurs went extinct in this era.
cenozoic era
mesozoic era
precambrian era
paleozoic era
question 15
1 pts
what determines when an era or a period begins or ends?
new species
climate change
mass extinction

Explanation:

Question 14

Dinosaurs went extinct at the end of the Mesozoic era. The Mesozoic era is known as the "Age of Dinosaurs". The Cretaceous - Paleogene extinction event (a mass extinction event) that marked the end of the Mesozoic era led to the extinction of non - avian dinosaurs.

Mass extinctions are significant events that often mark the boundaries between geological eras and periods. For example, the end - Permian mass extinction marked the boundary between the Paleozoic and Mesozoic eras, and the end - Cretaceous mass extinction (which caused dinosaur extinction) marked the boundary between the Mesozoic and Cenozoic eras. While new species and climate change can be part of the geological processes, mass extinctions are a key determinant for the beginning or ending of eras/periods.

Answer:

Mesozoic era

Question 15