Question

multiple select question select all that apply select all the proposed reasons for the mass extinction that occurred at the end of the permian period increase in carbon dioxide in the atmosphere, thus decreasing available oxygen release of toxic hydrogen sulfide by decomposing bacteria decreased sea levels volcanic eruptions, which altered global climate a very large asteroid that crashed into earth, disrupting food chains loss of gymnosperm forests on land

Explanation:

The end - Permian mass extinction was a major event. Volcanic eruptions altered the climate. An increase in carbon dioxide decreased oxygen availability. Release of toxic hydrogen sulfide by bacteria also contributed. A large asteroid impact is not a proposed cause for this extinction, and decreased sea levels are not a main proposed factor for the end - Permian mass extinction. Loss of gymnosperm forests on land is not a cause but rather a possible consequence.

Answer:

• Volcanic eruptions, which altered global climate
• Release of toxic hydrogen sulfide by decomposing bacteria
• Increase in carbon dioxide in the atmosphere, thus decreasing available oxygen