How can using a combination of policy tools be more efficient than using one exclusively? a. Using a combination of policy tools assures compliance.
b. Using a combination of policy tools allows for a wider range of coverage.
C. Using a combination of policy tools prevents the use of mandatory policies.
d. All of the above

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.

In each transformation of energy , some energy what?

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.