QUESTION: answer this: specific gravity is a comparison of the weight of a substance to the weight of an equal volume of??

ANS: a reference substance


QUESTION: answer this: when does last man on earth take place??

ANS: in late 2020


QUESTION: answer this: when was the national child labor committee established??

ANS: April 25, 1904


QUESTION: answer this: when was the last time china held the olympics??

ANS:
2008