part 1 of 1 - question 3 of 10 10 points how has earths atmosphere changed since it formed billions of years…

part 1 of 1 - question 3 of 10 10 points how has earths atmosphere changed since it formed billions of years ago? a. it was initially without oxygen and anaerobic bacteria began producing it as a waste product. b. it was initially full of oxygen but anaerobic bacteria began using it for energy. c. it was initially without carbon dioxide and anaerobic bacteria began producing it as a waste product. d. it was initially full of carbon dioxide but anaerobic bacteria began using it for energy. reset selection

part 1 of 1 - question 3 of 10 10 points how has earths atmosphere changed since it formed billions of years ago? a. it was initially without oxygen and anaerobic bacteria began producing it as a waste product. b. it was initially full of oxygen but anaerobic bacteria began using it for energy. c. it was initially without carbon dioxide and anaerobic bacteria began producing it as a waste product. d. it was initially full of carbon dioxide but anaerobic bacteria began using it for energy. reset selection

Answer

Brief Explanations:

Early Earth's atmosphere lacked oxygen. Cyanobacteria (a type of anaerobic bacteria in a broad sense relevant to early - Earth processes) later carried out photosynthesis and produced oxygen as a waste product.

Answer:

A. It was initially without oxygen and anaerobic bacteria began producing it as a waste product.