How is the plasma membrane of a cell organized?
question 15 options:

one layer of phospholipids, through which proteins freely move

one layer of phospholipids, which are laid out end-to-end, with a hydrophobic tail touching a hydrophilic head

two layers of phospholipids, each of which has its hydrophilic side turned inward

two layers of phospholipids, with their polar hydrophilic heads facing away from each other

The correct option is D. two layers of phospholipids, with their polar hydrophilic heads facing away from each other

Explanation:

The cell membrane is made up of two layers of phospholipids. The structure of phospholipids comprises of a hydrophobic tail which is made up of fatty acids and a hydrophilic head that is made up of phosphate. The structure of a cell membrane contains two fatty acid tails.

As the tail is hydrophobic, hence it is shielded and located inwards. The hydrophilic heads are located outwards in opposite directions.

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.