A catalyst can only be used once.
True
False

2. how is heavy water different from normal water

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

How do you lengthen a pattern piece? (family and consumer science, sewing)