Question

1. what do scientists believe caused the mass extinction at the end of the mesozoic era?

Explanation:

Scientists believe that a large asteroid impact, along with associated environmental changes like wildfires, climate cooling from dust blocking sunlight, and acid rain from sulfuric acid in the atmosphere, caused the mass extinction at the end of the Mesozoic Era. The asteroid impact is supported by evidence such as the Chicxulub crater in Mexico, which is of the right age and size to have caused such a catastrophic event.

Answer:

A large asteroid impact (along with related environmental disruptions) is the leading scientific explanation for the mass extinction at the end of the Mesozoic Era.