Root nodules are associations between bacteria and plant roots responsible for a. the plant convert necessary carbon dioxide for use. b. the plant convert necessary oxygen for use. c. the plant convert the necessary water for use. d. the plant convert the necessary nitrogen for use.

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.