Question

estion 1 - 2
s atmosphere is unique among the planets because it contains a large amount of oxygen. however, oxygen has not always been here. it was released as a
product of photosynthesis. early in the earths history, what was consumed, along with water and light, by photosynthetic organisms and then broken down to
release oxygen into the earths atmosphere?
carbon dioxide
water vapor
helium
oxygen

Explanation:

Photosynthetic organisms use carbon dioxide, water and light to perform photosynthesis and release oxygen. Carbon dioxide is one of the substances consumed in this process.

Answer:

carbon dioxide