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LUCA was the LAST universal ancestor not the first. Naturally it competed with other extinct species. My reseach suggests that LUCA was resulted from the fusion of 2 genomes. The evidence for this is that on reconstructing the amino acid sequences for LUCA enzymes we find some contain no cystine but do contain tryptophan or the opposite.


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The problem with Intelligent Design is that it doesn't appreciate that the forces that shape species (and individual organism) have to be constant and ongoing or the species disappears. The past matters little, it's what happens right here, right now that keeps species in any particular form. Biological system are not static structures like a building. You ...


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Evolution is about descent with modification. Spontaneous generation doesn't have that. It's about modern organisms emerging from raw molecules. If flies spontaneously appeared from rotting cow meat, why would they have DNA that made them look like they were evolutionarily related to other insects?


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You are right in the sense the evolutionary biology doesn't try to explain the origin of life as it is not within its scope. Other fields of biology investigate the question of origin of life (abiogenesis). Now, there is a very important difference between spontaneous generation and evolution. Life originated at some point and the through repetitive ...


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If you are interested in this question, I highly recommend you look at the work of Jack Szostak - Nobel Prize winner at Harvard who is currently doing some of the best work in this area. His work is grounded in good experiments that point to how abiogenesis could have happened.


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I think that it started like this: First stage: Chemicals like Na, Cl, O₂, O₃, CO₂, CO, HCN, and H₂SO₄ react to form small molecules. Second Stage: Next those small molecules react to form macromolecules. Third Stage: DNA, being the most stable was first to replicate. A membrane eventually enveloped this and formed the nucleus Fourth Stage: Via ...



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