An educated guess that is aslo posed as a tentative explanation is called a hypothesis.
Yes, Some Have The Same Body Cells Some Have Different Body Cells.
It depends on what kind of solution is referred as 0.65 M. If the solution where the red blood cell is present is hypertonic, the red blood cell will shrink. If the solution is hypotonic, the red blood cell will expand. If the solution is isotonic, the red blood cell will not expand or shrink.