How are videos any more credible than the internet? =/ Not to mention that my sources are actual scientists, not people with a pre-concieved religious bias (who are therefore not exactly neutral).
I own a book on the subject, if that's any better?
For what it's worth, scientists already have an explanation for how the complexities in humans arose. By 'organisms' I assume you mean organs? Indeed, we couldn't survive without most the organs we currently have. However, our non-human ancestors didn't necessarily need them like we do. They evolved along with the rest of us, and we're now at the point where we can't go without them - but a much earlier, much simpler ancestor (and I'm talking billions of years here, not just millions - these things weren't even mammals) wouldn't have needed them. They evolved because they made those ancestors work better ... they were an improvement, but not neccesary. However, later ancestors came to rely on these organs, and we're now at the point where they're neccesary, not just an improvement.
Regarding organs ... how do you explain the human appendix? It has no use in humans. It does nothing but randomly blow up and kill the owner. It's used for processing leaves - something humans don't eat, but our ancestors did. It's a biological relic of our past as non-humans.
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