16. When scientists ask questions or make inquiries, they begin a process of investigation that leads them to discoveries, answers to their questions and opportunities to ask additional questions. This process is known as A. observation
B. experimentation.
C. data.
D. the scientific method.

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 is an example of a decomposer? a. bear b.algae c.grass d.bacteria d bacteria

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?