Astudent observing onion cells using a microscope was having difficulty seeing any detail in the cells. state
one action the student could take to improve the detail.

you can't see the options

the dark variety, as they are not visible on the dark tree barks

explanation:

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this