I'm pretty sure it's Cells
4 billion years ago the temperature was much higher due to repeated volcanoes and hot gases present in the atmosphere. There weren't any live forms on earth. ... The atmosphere had a different concentration of gases on the earth. There were no life sustaining gases.
Answer:
D
Explanation: Decomposers are like grinders, they break down dead animals and plants.
The correct answer is Nucleic Acids. I hope this helps. :)