A scientist conducts a test and finds out that the LD50 of a certain chemical is 20 mg per kilogram. Explain what this means. PLEASE HELP 20 POINTS

Which characteristic should describe all evidence collected by a scientist? true obvious objective subjective

During photosynthesis, hydrogen ions are most directly used to in the chloroplast pictured above. a) make glucose b) make chlorophyll c) produce carbon dioxide d) drive the production of atp

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.