Which of the following is not mechanical digestion? * chewing food
contractions in small intestine
churning of the stomach
action of pepsin on proteins

How do chloroplasts set plants apart from other living things

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 produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above