Question

The Permian mass extinction occurred about 248 million years ago, well before humans entered the scene. It was the greatest mass extinction ever recorded in Earth's history. About ninety-five percent of all marine species became extinct as a result of the Permian extinction.Although scientific theories vary, it is believed that _____________________ caused the Permian mass extinction.Group of answer choicesthe start of glaciation and natural climate change.plate tectonics.the introduction of dinosaurs.the human enhanced greenhouse effect

Answer 1

Permian extinction happened at the end of the Paleozoic Era, this was before humans and also before dinosaurs, so options C and D cannot be causes of the mass extinction.

It's believed that, among the causes of the Permian extinction, there was volcanic activity, that launched carbon dioxide into the atmosphere, ocean anoxia, ocean acidification, and liberation of greenhouse gases from the ocean because of the movement of the tectonic plates, which caused a rise of the temperature.

This means that the correct answer would be B, plate tectonics.