What effect do limited resources and unlimited wants have on the economy? p.7

It means that people never get enough, that there's always something else that they would want or need. Unlimited wants and needs are one half of the fundamental problem of scarcity that has plagued humanity since the beginning of time. The other half of the scarcity problem is limited resources.

a. it led to stricter immigration laws.

which elements do geologists measure to determine the age of an organism’s remains? check all that apply.

carbon-14

nitrogen

carbon-12