Nucleotides are the basic unit of which macromolecules?

Nucleic acid

Explanation:

Nucleotides are the basic unit of Nucleic acid

A nucleotide consists of three groups –  

a)5-carbon sugar (ribose or deoxyribose)

b)a nitrogen-rich base   - There are four nitrogen rich base namely cytosine (C), guanine (G), adenine (A), thymine (T)

c)and a phosphate group

The nucleotides are the repeating units of a nucleic acid and  therefore a nucleic acid can be considered as polymer while a nucleotide becomes its monomer unit.

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.