What data would you need to see in order to draw conclusions about the effectiveness of preventive surgeries

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

what bodys are there orbiting?

c. is the correct answer

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.