What are fossils of organisms that existed over a wide area but only for a limited time period called?

I think the answer is index fossils. Index fossils tell the relative age of rocks, and fossils of organisms that were widely distributed but only lived during a shorter period of time are called index fossils. Hope this helps :)

according to kinetic-molecular theory, the following would not be considered an ideal gas:

a gas at very low volumes, when gas particles are very close together

a gas at very low temperatures, when gas particles have very little kinetic energy a gas

a gas with highly polar molecules that have very strong intermolecular forces

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colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock