What facilitates a cells ability to exchange materials between the cell and its environment?

Differentially permeable membrane.

Explanation:

Differentially permeable membrane is defined as the membrane that allows the passages of materials between the cell, and it's environment. It's allow the movement of some particles such as small molecules not large molecules like solutes.

It is also known as semipermeable membrane. It is also important for maintaining turgidity, and help to retain the ability to absorb solutes.

the tricuspid valve is present between right atrium and right ventricle

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.