A fossil that forms when the hard parts, I. e bones, wood, etc.., are turned into stone A: index fossils
B: mold and cast
C: petrified fossils
D: trace fossils

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

Which blood cell spend most of their time in the lymphatic system?

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.