Εγώ θα ομολογήσω ότι δεν μπορώ να συλλάβω πως γίνεται η φυσική εξέλιξη ειδικά στα πρώτα στάδια.
Καταλαβαίνω πως ένα ψάρι μπορεί να γίνει κροκόδειλος και μετά πουλί ξέρωγω. Επίσης, πως ένα μικρόβιο μπορεί να γίνεται μεγαλύτερο για να έχει αβάντα όταν καταπίνει τα άλλα μικρά. Αυτά όμως είναι ήδη ΥΠΕΡ-ΠΟΛΥΠΛΟΚΟΙ οργανισμοί, πάνω στους οποίους μπορούν να παίξουν οι μεταλλάξεις και να έχουμε "εξέλιξη".
Αλλά ακόμα και η απλούστερη μορφή ζωής απ'ότι καταλαβαίνω, χρειάζεται ένα μόριο RNA που να κωδικοποιεί πράγματα, ώστε να πούμε ότι μεταλλάξεις σε αυτό οδηγούν στην εξέλιξη. Ε αυτό εγώ δεν μπορώ να το καταλάβω. Μια απάντηση στο quora που εξηγεί τι εννοώ (χωρίς να ξέρω αν είναι ακριβείς οι λεπτομέρειες) είναι η εξής:
Excellent question, and the core issue in origins of life quest. The way I see, the initial RNA/DNA encoding templates for enzymes and proteins for the simplest truly living entity--metabolizing, growing until reproductive viability, forming a protective wall, that is to say, alive--the number of nucleic acid base pairs necessary to encode a copy of the SIMPLEST life form would be.....let the archeo-biologist give a best approximation: 50,000 base pairs? 100,000 base pairs? The 'simplest' life on earth has, what, 1million or 2 million base nucleic acid base pairs in its DNA. Let's assume that there could be something performing living functions with a tenth that length, ie, 200,000 nucleotides. For self-replication, a living entity must at minimum be 'instructing' itself to create Helicase molecules to 'unzip' its DNA/RNA, Gyrase molecule to keep them from binding up in tertiary structure as they untwist, Polymerase to catalyze new strands from the two daughter strands. (It's slightly possible that only 200,000 base pairs would encode sufficient information, it's meant as an illustrative number.) If that size of a DNA/RNA molecule COULD serve as template for sufficient proteins and enzymes for life, it had to be there FROM THE BEGINNING. There doesn't seem to be any reason for a step-wise piece-meal process serving as a trajectory, how anything less than encoding these functions would serve to be preserved and to multiple itself, an entity continualy propagating, creating a specific type or species of life upon which evolution could then work. So I still wonder: how did (say) 200,000 nuclietides in free float (leaving aside the question how such a concentration of adenine, guanine, cytosine, guanine or uracil came to be in a tide pool) spontaneously and by chemical attraction as it were, come together, in order to enable the copying/reproduction of the first life form? I don't know. I'd like to read a feasible explanation. Intelligent design folks say "divine intervention," creation ex nihilo. Natural scientists decry "arguing from ignorance." My son's biology book speaks of 'pre-biotic synthesis of small organic molecules' and of 'proteinoid microspheres,' of the 'appearance' of 'Oxidative Metabolism,' but not of DNA/RNA origins. Did first entity metabolize and then later metabolize a self-encoding molecule nucleic acid? Explain that to me. I confess ignorance, and insufficient time to read all the literature.
ΥΣ. Ούτε το intelligent design ή god είναι αποδεκτά, καθώς εξηγούν ακόμα λιγότερα πράγματα, έτσι;
