Parents of newborns often complain about being chronically tired because their infants' crying, feeding, and diaper changing interrupt their sleep. after many nights, they develop what is known as:

 The correct answer is:

                     →  " sleep debt " .

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answer:

know one knows until they die

Explanation:

answer:

None of them! It's just a virus.

Explanation:

Virus is an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.