Question

there have been 5 mass extinctions in earths history. which of the following answer choices was a cause of these extinctions?
increased carbon dioxide (co2) levels in the atmosphere
an asteroid impact
melting of glaciers and rising sea levels
widespread volcanic activity
all of them

Explanation:

Each option corresponds to a known cause of Earth's five mass extinctions:

1. Increased atmospheric CO₂ drove ocean acidification and climate shifts in events like the Permian-Triassic extinction.
2. An asteroid impact is the leading cause of the Cretaceous-Paleogene extinction that killed non-avian dinosaurs.
3. Glacial melting and sea level rise disrupted coastal and marine ecosystems during events like the Ordovician-Silurian extinction.
4. Widespread volcanic activity, such as the Siberian Traps eruptions, triggered the Permian-Triassic extinction via climate change and toxic gas release.

All options are valid causes of past mass extinctions.

Answer:

All of them