Why is it not totally surprising that animals can suffer from emotional distres

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.

What does the symbol (–hfus) indicate in a phase change?

Which change to the system wood cause the freely-moving piston to lower?