To have a thing to compare your test results to. The control is not changed at all in an experiment so your other test results can be compared to it. It’s like the base level kinda
Hey! i believe the answer is diffraction
Good Luck!
Hello :3
I believe your answer would be 1, 2 and 5.
Hope this helps!
Cupkake~
Seismometers and Seismographs
The sugar molecules thus formed contain carbon,hydrogen, and oxygen: their hydrocarbon backbones are used to make amino acids and to make other carbon based molecules that can be assembled into other large molecules.