Someone wanna have a rap battle

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

The molecular mass of a gas is (select all that apply) a. independent of the type of gas b. the same number as the atomic (or molecular) mass, but measured in grams c. dependent on the temperature d. the mass of a mole of the gas