Which of the following best explains why the biosphere is a key component of the earth’s systems? a the biosphere is a key component of the earth’s systems because it is a common concept to many disciplines in science. b. the biosphere is a key component of the earth’s systems because the seasonal cycles directly affect primary productivity. c the biosphere is a key component of the earth’s systems because it drive the other systems by interacting with and exchanging matter and energy with the other spheres. d the biosphere is a key component of the earth’s systems because it has evolved to create the chemical composition of the planet we know today.

I think the answer is b

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.