Explain why cells have semi-permeable membranes. What are semi-permeable membranes, what do they help maintain, and what cell organelle helps regulate this?

Explanation:

I FEEEL UR PAIN I JUST TOOK THE TEST FOR THIS IN BIO... but anyways cells have semi-permeable membranes so they can let waste products out of the cell and other things in. A semi-permeable membrane is almost like a barrier with a gate around a cell, and they control what goes in and out of the cell I. Don't take my word for the maintaining part but I think homeostasis, and idk the last one.

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.