The Main Chemical Building Blocks of Life, Carbon, Nitrogen, Oxygen

Multiple Choice

The main chemical building blocks of life, carbon, nitrogen, oxygen, and iron were formed

A) inside interstellar gas clouds during star formation
B) in the center of the Earth and then ejected onto the surface via volcanism
C) in the nuclear burning cores of stars and then ejected into space when they died
D) in the Big Bang that created the universe