Which of the following has NOT been proposed as a mechanism for the Permo-Triassic
mass extinction:
O Widespread cooling and glaciations
O Low oxygen and high carbon dioxide levels in the oceans
Release of methane from coal and marine deposits
Widespread volcanic eruptions"
(a) Widespread cooling and glaciations
(b) Low oxygen and high carbon dioxide levels in the oceans
(c) Release of methane from coal and marine deposits
(d) Widespread volcanic eruptions