There are 7 significant figures
1) C !! Physical Process
2) A
3) D !! Water is universal solvent !
if you need any explanation ; comment !!
Stimuli that can make you run faster:
1. sound: if you hear a wild animal running after you that will make you run faster
2. vision: viewing something scary or unpleasant acts as a stimuli to make you run faster
3. pain: pain as a stimulus will make you run faster as it your bodies way of protecting you from harm
Hope this helps good luck <span />
The first one is the answer
isotopes of an atom have different number of neutrons . the number of protons are not different in isotopes of an atom
NaF, because both are metal. I hope that can help.