Acollision with a large meteorite may have contributed to the mass extinction at the end of the era.

Answer;

Mesozoic

A collision with a large meteorite may have contributed to the mass extinction at the end of the Mesozoic era.

Explanation;The Mesozoic Era is the era known as the age of the dinosaurs and lasted almost 180 million years. Mesozoic Era consist of three periods namely the Triassic, Jurassic, and Cretaceous periods. The beginning and the end of Mesozoic Era was marked by a mass-extinction. It is believed that the mass extinction was caused by a meteorite impact, that caused the end-,Mesozoic extinction. The mass extinction wiped about 95% of marine life and 70% of land life. This mass extinction caused the transition from the Paleozoic era to the Mesozoic era.

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Essential for a scientist to do for credibility

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.