Question

the permian mass extinction occurred about 248 million years ago. it was the greatest mass extinction ever recorded in earths 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. a global warming b an asteroid hitting earth c the introduction of dinosaurs d the start of glaciation and climatic changes

Explanation:

The Permian mass extinction is linked to volcanic activity causing global warming (via CO₂ emissions), which disrupted ecosystems. An asteroid impact is associated with the Cretaceous-Paleogene extinction (dinosaurs). Dinosaurs emerged after the Permian extinction, so they can't be a cause. Glaciation was an earlier event; the Permian extinction was driven by warming.

Answer:

A. global warming