Which of the following areas of the conduction system would produce spontaneous action most frequently if the sa node were not functioning?
a. av bundle
b. purkinje fibers
c. av node
d. bundle branch
e. the pacemaker

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Where can dna be found in a prokaryotic cell

Consider the venn diagram of plant reproduction. where in this image, areas a - d, would you insert the picture of the orange lily?