Which equation(s) are used to detect the presence of dark matter in galaxies? a) doppler shift equation b) kepler's 3rd law c) wien's law d) a and b

i would say the answer is food.

hope this !

f is prop to m1xm2 double m1 double force

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.