Is matter conserved when there is the same amount before and after a change?

What problem would a person have if the nucleic acid in one of his or her cells were damaged?

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.

Explain that newton first law,second law and third law of motion?