The endosymbiotic theory explains the evolution of eukaryotic cells. according to the theory, ancient prokaryotes developed a symbiotic relationship with smaller prokaryotes that lived inside them. some of these smaller prokaryotes could use oxygen to make atp. these aerobic prokaryotes evolved into mitochondria. others could perform photosynthesis. these evolved into chloroplasts.

is this a psat question, if so do not cheat try your best.

explanation:

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the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.