It was originally thought that oxycodone (brand name: oxycontin) was useless for treating pain safe from potential abuse more addictive than vicodin a useful treatment for skin itching

It was originally thought that oxycodone (brand name: oxycontin) was safe from potential abuse.

When oxycodone was firstly discovered, it was thought that it can replace heroin and morphine, because of their massive hazardous and harmful use, and dependence. But that wasn’t the case, because oxycodone shortly became common drug of abuse.

It is still used as an opioid medication for treatment of moderate to severe pain.

digestion

it excretes wastes

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.