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

C. Adding Oxygen to the atmosphere

Explanation:

Most living things need oxygen (Including humans) to survive

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.

answerthey are called the pampas;