7. The cell theory was
a. first identified in 1665
b. the end result of many scientific investigations
c. described by Rudolf Virchow
d. Both (a) and (b)

How does the study of genetic disorders such as pku biologists understand normal alleles?

4. if a cell is placed inside a solution that has a higher concentration of solute than on the inside of the cell, what can be said about the movement of water? a. water will move out of the cell, causing it to shrivel. b. water will move in and out of the cell at the same rate. c. water will move out of the cell, causing it to swell. d. water will move into the cell, causing it to swell.

The data below simulate what happened to peppered moths in england after the industrial revolution which statement best describes the process that produced one of the emding populations of moths ?light colored moths were selected for on light colored trees