Which of the following is not part of cell theory? a. the basic unit of life is the cell (i think this is the answer) b. cells came from pre-existing cells. c. all living organisms are composed of cells. d. cells contain membrane-bound organelles.

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

Urgent. the table shows the relative blood flow through some organs in the human body that is, the percentage of blood that flows through a given organ, through which organ(s) does all the blood flow? explain the effect of exercise on blood flow to skeletal muscles.