Which elements have the same number of energy shells (levels)? magnesium (Mg)
rubidium (Rb)
boron (B)
iodine (I)
argon (Ar)
silicon (Si)

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 can be found in the ionosphere

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)