As early multicellular organisms evolved, they released more __________ into the atmosphere.
A) hydrogen
B) oxygen
C) nitrogen
D) argon

Question

Quizplus · Accepted Answer

Early multicellular organisms, such as cyanobacteria, evolved the ability to perform photosynthesis, which releases oxygen as a byproduct. Therefore, option B is the correct choice as multicellular organisms released more oxygen into the atmosphere.

As Early Multicellular Organisms Evolved, They Released More __________ into the Atmosphere