<em>Answer:</em>
<em>4. The formation and evolutuion of stars and galaxies</em>
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Answer:
B. they share their electrons
Scanning electron microscope- this is a type of microscope that uses beams of electrons to view the surface of a specimen. it is used to provide a three-dimensional image of cells
transmission electron microscope- uses beams of electrons to examine the insides of thin slices of materials. it is used to provide a two-dimensional image of cell structures