Which of the following BEST describes the flow of energy through a food chain?
A. Energy flows between primary producers and consumers, in either direction.
O
B. Energy flows from consumers to primary producers, in one direction only.
O
C. Energy flows from primary producers to consumers, in one direction only.
D. Energy flows between primary producers and consumers, in an endless cycle.

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.

Environmental impacts on evolution : mastery test

What is the similarities and differences between bacteria and eukaryote?