Cold, dense air at thecreates areas ofpressure at the

What is the most common reason for matter changing its state?

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth

Which of the four hypothetical substances you investigated would be most harmful to living organisms? 50 points!