Massive release of methane hydrate from the ocean floor would cause which atmospheric gas to decrease...?

Question

Massive release of methane hydrate from the ocean floor would cause which atmospheric gas to decrease

a. carbon dioxide

b. Hydrogen

c. Oxygen

d. both carbon dioxide and hydrogen

e. both hydrogen and oxygen

Answer 1

That would be c. oxygen. Can you name which mass extinction is now thought to have occurred as a result of this happening?

Answer 2

c because methane is made up of 1C and 4H