What is a plants role in the carbon cycle?
a. plants take in oxygen and release carbon dioxide
b. plants take in carbon dioxide and pass it on to animals.
c. plants take in carbon dioxide produced by other organisms.
d. plants use carbon dioxide to make protein.

B.plants take in Carbon dioxide and pass it on to animals.

Explanation:

Plants remove carbon dioxide from the atmosphere and use it during photosynthesis to create sugars. Animals that eat these plants digest these sugars to create energy. Animals then release carbon dioxide and other compounds that contain carbon via respiration and excretion. Once animals die, they release carbon compounds into the atmosphere and into the ground as they decompose.

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.