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2 answers:
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brainly.com/question/5027087
Let C, S and H be the diameters of cell, sand and hair
Diameter of a cell:
Diameter of a grain of sand:
Part A:
meters, because it takes 5 movements right of the decimal dot, until there is only one digit to its left.
Part B:
we are comparing
to 
,
thus S is 20 times larger than C
Part C
thus,
Part D.
thus 300 nm are written in meters as follows:
Let C, S and H be the diameters of cell, sand and hair
Diameter of a cell:
Diameter of a grain of sand:
Part A:
Part B:
we are comparing
thus S is 20 times larger than C
Part C
thus,
Part D.
thus 300 nm are written in meters as follows: