Multiple choice

True or false: Ocean plants produce half or more of the oxygen that humans and other land-dwelling creatures breathe.

  1. True

  2. False

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is true that marine organisms, primarily phytoplankton, kelp, and algal plankton, produce between 50% and 80% of the oxygen in Earth's atmosphere through photosynthesis.