Complete the statements below. We measure the ratio of choose your answer...
atoms produced during radioactive decay as a means for determining the
type your answer...
using rocks, meteorites, and moon rocks.

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

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

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?