What would happen if our atmosphere consisted of pure oxygen?

Topographic maps are used to measure a-composition b-movement c-elevation d-texture

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

Witch one is it soo it the the question b.a,b,c,d