As my memory serves me well, innovations like the production of gunpowder, tea, and silk are usually attributed to D. China
The correct answer is Lake Baikal
I'm pretty sure some they are People adapt to their environment, changes to the earths enviroment can be benificial, Changes to the earth environment can be harmful, people change their environment, I'm sorry if I'm wrong on some of these. I hope this helps also :)
The answer is 2x+3 because the expression cannot be simplified any further because they do not share the same variable which is x
