8. Valves prevent blood from flowing backwards. Valves are located in the O
veins
heart
heart and arteries
heart and veins

At the complete end of cellular respiration, how many molecules of atp are produced?               a.  15    b.  26    c.  38    d.  34 

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

Select all that apply. why are common names not a good reference to a species? common names can be in different languages common names vary with location common names vary with culture common names vary with species color