Answer:
Photosynthetic organisms were making oxygen, but it reacted with the iron dissolved in seawater to form iron oxide minerals on the ocean floor, creating banded iron formations. ... The oxygen that is now in the Earth's atmosphere was not there at the beginning.
Explanation:
The answer is b
i hope this helps
Which of the following describes how Nerva affected the Roman Empire? (4 points)<span>He was a cruel and violent leader who killed many Christians.He was responsible for the creation of the Twelve Tables.He helped poor farmers by giving them land.<span>He built walls to strengthen Rome's borders.</span></span>
Answer:
they eat food because they need energy to do any activity or function that they get energy from food.
A cow eating grass in a field would be one
