CaCO3
Waht is the name of this compound ?

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.

The excretory system,need answers for all: )

In in , is to a 28.4-g (1-oz)−23.0 °c to −1.0 °c?