Why is it difficult to separate the topics of anatomy & physiology?

What must be true for natural selection to heppen

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.

Why zebra fish experience similar genetic disease as human