Which of these statements is true about autotrophs, but not heterotrophs? A) They use sugar and oxygen to make carbon dioxide and water.
B) They use chlorophyll and oxygen to make carbon dioxide and water.
C) They use sunlight, water, and carbon dioxide to make sugars.
D) They use sunlight, water, and oxygen to make chlorophyll.

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

The influenza virus cause the flu, but not other diseases. why?

Which muscle is responsible for inhalation ?