In your own words, write the definition for Nuclear envelope.

The nuclear envelope surrounds the nucleus of a cell, which houses the genetic material in eukaryotes. It is made up of two lipid bilayer membranes: an inner nuclear membrane and an outer nuclear membrane. Essentially, it is the double membrane layer that seperates the contents of the nucleus from the rest of the cell.

b is the best answer for this 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.