4. Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today.
A. oxygen
B. lead
C. hydrogen
D. ore
A?
Reed told me yes for A,but I still was not sure!
I'm not Ms.Sue, but you're correct. :)
Thanks I will go with this answer and tell you if it was right.☺
The answer is a because Cyanobacteria are photosynthetic organisms, like plants, they produce sugars and O2 from carbon dioxide and water (..and energy from sunlight).
You were right.
To determine the correct answer, we can start by understanding the role of ancient cyanobacteria in the formation of the Earth's atmosphere. Cyanobacteria are ancient photosynthetic microorganisms that played a significant role in the development of the atmosphere billions of years ago.
These bacteria were capable of photosynthesis, a process by which they use sunlight, water, and carbon dioxide to produce energy and oxygen as a byproduct. Over time, the release of oxygen through photosynthesis by cyanobacteria led to a significant accumulation of oxygen in the Earth's atmosphere.
Given this information, we can conclude that the correct answer is indeed A. Oxygen, as ancient cyanobacteria released oxygen through their photosynthetic activities, contributing to the creation of the atmosphere as we know it today.