1.Each with two or more; every with three or more
Each and every are both normally used with singular nouns. Each can be used to talk abouttwo or more people or things; every is normally used to talk about three or more.
The business makes less money each/every year. (NOT….each/every years.)
She had a child holding on to each hand. (NOT…every hand.)
Note Every (which is normally used with singular nouns) can be used before plural expressionsin measurements of frequency. For example: every two years， every tree steps.
I go to Hong Kong every six weeks.
2. difference of meaning
In many cases， both each and every can be used without much difference of meaning.
You look more beautiful each/every time I see you.
But we prefer each when we are thinking of people or things separately， one at a time. Andevery is more common when are thinking of people or things together， in a group. (Every iscloser to all.) Compare:
Each person in turn went to see the doctor.
He gave every patient the same medicine.
We do not use each with words and expressions like almost， practically， nearly or withoutexception， which stress the idea of a whole group.
She’s lost nearly every friend she had. (NOT…nearly each friend…)
Almost (every) the hereditary (material) of (an individual) organism resides (in the)chromosomes.
The correct answer is: every -----> all.
It's for sure that “every” is wrong in the sentence， but if “every” ------> "each of"， “ almosteach of the…” is still wrong.
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