Why did the results of her experiment confuse Paola? A) She did not control the amount and form of sugar she added. B) She did not control amount of water she used. C) She did not control the temperature of the water. D) She did not measure the time it took for the sugar to dissolve.

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