HOW IS THE SKELETAL SYSTEM LIKE AN ENGINE?

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

Photosynthesis uses co2 and cellular respiration produces co2. we call the point when the two processes are in balance--when there is no net production of co2--the compensation point. how might you limit one of the processes in order to achieve a compensation point?

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