Question

2. Before life evolved adaptations for living on the land, a major change in one of Earth's systems took place.

Which of the following was a change that made it possible for life as we know it to live on the land?
A addition of carbon to ocean water
B. addition of sodium to ocean water
C. addition of oxygen to the atmosphere
D. addition of ammonia to the atmosphere

Answer 1

C. Adding Oxygen to the atmosphere

Step-by-step explanation:

Most living things need oxygen (Including humans) to survive