Heterotrophs select one: a. have the ability to synthesize organic molecules from inorganic molecules. b. are ultimately dependent upon preformed organic molecules made by producers. c. are the origin of all food for the rest of the living world. d. are also called autotrophs. e. none of the answer choices is characteristic of heterotrophs.

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.

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

In general, did the simulated mice align with your predictions from the punnett squares? yes or no?