Which types of changes must follow the law of conservation of mass? (2 points) O Both physical and chemical changes
O Neither physical nor chemical changes
O Only physical changes
O Only chemical change

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added

Salt in oceans comes from and of rocks