* 8. What does evolution mean?
a. To change something
b. To change and adapt over time
c. To lose some original features
d. To improve something over time

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above

The carrier molecules of the electron transport system are located in the