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When we talk functional macromolecules (...

When we talk functional macromolecules ( e.g., proteins as enzymes, hormones, receptors, antibodies etc. ), towards what are they evolving ?

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Functional macromolecules are evolving towards creation of a complex organims. There are various evidence that are common to simple and complex forms of lite indicate common ancestry, e.g., histones protein tend to be well preserved among all eukaryotes, from amoebas to blue whale or to humans, with only one or two amino acids different.
The genetic code is nearly identical for all known life forms, from bacteria to archaea or animal and plants.
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