Physical and chemical properties of the earth
A. are the same in every layer.
B. are the same in the inner and outer core.
C. are used to distinguish the layers of the earth.
D. never change.

Which label correctly identifies what x represents in the concept map?

We can be sure that a mole of table sugar and a mole of vitamin c are equal in their 1) mass in daltons. 2) mass in grams. 3) number of molecules. 4) number of atoms. 5) volume.

Which of the following is caused by reproductive isolation within a species? a. a decrease in gene flow b. an increase in genetic flow c. a decrease in genetic drift d. an increase in gene flow