A substance X contains 10 gram of calcium carbonate calculate the number of oxide of calcium carbonate present in X

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.

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.

Light waves can move through , but they travel fastest when they move through a(n) .