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Life is something that obeys the laws of biology. An object of sufficient complexity can acquire emergent properties that can no longer be described by lower-level laws.
Protein is not life, it is biochemistry. DNA is not life, it's biochemistry. The virus is life. Proteins and DNA are driven by the chemical properties of these substances.
Gc. I haven't seen any really adequate definitions of the concept of “life”… and I won't give it here and now: >
But-Life is a process. Biochemical for our form. Supporting energy homeostasis…. This must be present there: >
Of these objects and substances, the closest thing to the “quinto essence” of our life form is the DNA molecule (or RNA, where it has the corresponding DNA function). But it's actually just acid: >