(ii) The atomic number of boron is 5. Boron exists as two isotopes boron-10 and boron-11.
Use this information to explain why boron-10 and boron-11 are isotopes.

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 independent variable in this investigation? mass volume sample number substance density

Why do cells appear different in distilled water than they do in 10% salt water?