Hi this isn't a hard question I just can't understand what it's asking me... Please help!
"How many variables differed between the experiments?
A) 1
B) 2
C) 3
D) 0"
The lab we did was adding water drops and soapy water drops on a penny to measure the surface tension, we also another one with 4 different temperatures of water.

Question

Hi this isn't a hard question I just can't understand what it's asking me... Please help! 
"How many variables differed between the experiments?
A) 1
B) 2
C) 3
D) 0"
The lab we did was adding water drops and soapy water drops on a penny to measure the surface tension, we also another one with 4 different temperatures of water.

anonymous · Answer

we also did* another one

loser66 · Answer

To me, it is just 1 water vs soap.

anonymous · Answer

but we did 2 different experiments... and for the other on we tested the surface tension with water that was 4,25,37, and 100 degrees..

anonymous · Answer

YAY!!! thank you so much the timer was running out and i just went with 1 and got a 100!!! :D

anonymous · Answer

@Loser66