What are the constants (controlled variables)? Select all that apply. * 2
Number of daphnia
Heart rate of daphnia
Type of petri dish
Different concentrations of caffeine solution
Amount of liquid
✓ Type of microscope
Species of daphnia

Which statement best explains why cells were observed in more detail using a compound microscope than a simple microscope? a compound microscope has greater magnification ability than a simple microscope. the compound microscope was invented before the simple microscope. a compound microscope is much easier to manufacture than a simple microscope. compound microscopes were more common than simple microscopes.