Which is an example of a compound machine?

ramp

bicycle

crowbar

seesaw

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

What component of earth’s atmosphere exists entirely as a result of photosynthesis?