When living things use chemical reactions to break down food, some of the energy is transformed into

The correct answer is "heat".

Explanation:

The missing options of this question are:

A. sound.

B. waste.

C. heat.

D. light.

The correct answer is option C. "heat".

Organisms use catabolic reactions to break down food and obtain the energy they need to live, mainly in the form of adenosine triphosphate (ATP). However, not all the energy from the reactions can be used by the organisms, as some of the energy is lost in the form of heat. Actually, for this characteristic, catabolic reactions are also known as exothermic reactions in organisms.

what's the question ?

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.