Why are blood cells differennt from skin cells

The same is true for our skin and our liver cells. Or our brain and muscle cells. Or any of the other 300 or so different cell types. These cells are different because they use the same set of genes differently.

because the blood cells are in the vains and im not too sure were skin cells are

the statement is true

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.