Make up a new planet. Describe the important features of the landscape, what the climate is like, and what lives there. Write from the viewpoint of the first visitor to this planet.

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

Write the balanced chemical equation forphotosynthesis.

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?