The answer is <span>A) Velocity describes speed with direction.
Speed can be in any direction </span>
The stuff you dissolve is the SOLUTE. What you dissolve it IN is the SOLVENT.
B. Many systems work together to control the internal environment of the body. This process is known as homeostasis.
I did try to solve. I hope it is correct, below is the solution:
<span>put everything in s.i units
then the answer what u wrote is acceleration to get is divide by mass(80)
G=6.011*10^-11
M=6*10^24
R=6.4*10^6
m=80
</span>
Hope it helps.