9 Why did the auto industry make a change from generating cars that relied on diesel fuel to cars that ran on unleaded gasoline in the 1970s?
vehicles that used unleaded gasoline were less likely to break down
burning diesel fuel pollutes the air more than burning gasoline
unleaded gasoline was cheaper to manufacture than diesel
unleaded gasoline was easier to make than diesel fuel

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c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

i dont know the answe

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.