The most common source of contamination with E.coli is by eating contaminated food like meat and eggs.
The number 1 correspond to messenger RNA.
They should be carbohydrates, fats (lipids) and protein. they are labelled as primary food substances and they're essential to life. they can provide energy and raw material for life processing. although mineral ions and vitamin are important too, but they only need a small amount.
Its C i think! i hope this helps
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