The answer is B. It is the only one where each element has the same number of molecules on each side.
F. Clouds and Carbon dioxide. Because CO2 absorbed by trees and clouds gives water to the trees and plants.
D. Scientists use all of the above skills.
B. Because a physical reaction is a change that can be seen. This particular situation is happening over a period of time, it isn’t something that happens instantly. Also I it would have been a chemical reaction, it would have mentioned something about the state of an element or the temperature or something along those lines.
I think it's organisms that have extreme traits! i hope this is right!
