Correct answer: Halftone
The halftone is a reprographic technique, which uses continuous imaginary tone by the use of dots, which vary in size or in spacing.
Example: The shades of gray in print are produced by breaking the image of the object into tiny dots that appear to blend into a continuous tone when viewed with a naked eye. Such a pattern of tiny dots is called a halftone.
Compound microscope is being used..
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Oxygen's valence, based on the Number of valence electrons or outermost electrons that oxygen has would be 6.
3rd and 4th awnsers are correct
