The atmosphere is a mixture of gases. it is mostly composed of oxygen and carbon dioxide, nitrogen and oxygen, carbon dioxide and water vapor, nitrogen and carbon dioxide

The correct answer is B. Nitrogen and Oxyen

Explanation

The Earth's atmosphere is a gaseous layer that surrounds the earth, this layer is mostly composed of Oxygen with 21% and Nitrogen close to 78%, in addition to a minimum amount of Argon of about 1%. The Earth's atmosphere is of great importance for life on Earth because it allows the sun's rays to not enter the earth with the same intensity that they are produced, they also make the surface temperature regulated on the earth allowing the lifetime. So, the correct answer is B. Nitrogen and oxygen

since there isn't any suggested answers i will give you the reason and hopefully you can figure it

south africa, or rather all of africa, has not been in the location in which it is nowadays throughout the geological past. after the super-continent pangaea started to break apart, gondwanaland, in which was africa, moved further south, and parts of it came to be very close to the south pole. because the climate in this part of the world is very cold due to the very dispersed sun rays in there, what is now south africa, started to freeze, and the conditions were right for the formation of glaciers. the glaciers existed up until the period when gondwanaland started to break apart and what is now africa started to move towards north, sp it warmed up and the glaciers melted.