A Only one variable changed
It makes sense that increasing the rate of plastics recycling is helpful for eliminating waste. Think about it, when something can be reused, then it should be. Recycling allows this to happen and prevents landfills from being filled too quickly.
I don't know if there were multiple choice answers or anything but i would say, "determined"
The layer of the sun is in three equally side the sun the moon and the galaxy
