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A student used a compound microscope to obtain data on leaf stomate density. The student observed a small area of the lower epidermis of a leaf and counted two stomates in the high-power field of vision. The student then observed a small area of the upper epidermis of the same leaf and found no stomates in the high-power field of vision. After making these observations, the student should
1. assume that leaves never have stomates on their upper surfaces
2. conclude that the lower epidermis of this leaf has a greater stomate density than the upper epidermis has
3. conclude that the lower epidermis of all leaves has a greater stomate density than the upper epidermis has
4. make additional observations before drawing conclusions about leaf stomate density
1. assume that leaves never have stomates on their upper surfaces
2. conclude that the lower epidermis of this leaf has a greater stomate density than the upper epidermis has
3. conclude that the lower epidermis of all leaves has a greater stomate density than the upper epidermis has
4. make additional observations before drawing conclusions about leaf stomate density