In chloroplasts, when the two photosystems work in series, electrons ejected from the photosystems do not return to them, which is known as . Multiple choice question. oxygenic photophosphorylation cyclic photophosphorylation noncyclic photophosphorylation NADPH based photophosphorylation

Barbara is converting 78°f to degrees celsius. first, she subtracts 32 from 78. what is the next step?

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.

Vessels draining the myocardium of the heart, open primarily ,into which chamber?