Be patient. I’m a scientist that has responsibilities to tend to also. Give it at least 1 week before repeating a question you know I’ve seen. Also do not address it to me specifically. Others can help you too.
I’ll answer it now though.
This has nothing to do with common descent. Your argument is a non-sequitur for tow reasons.
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Common descent does not attempt to explain the “anatomical and physiological differences” between related species. You might as well reject quantum mechanics for failing to explain the orbit of the moon around the earth.
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Many of mechanisms that give rise to the “anatomical and physiological differences” between different species are well known. It is an active area of research to refine our knowledge, and to continue growing it.
I understand you are unaware of #2. @T.j_Runyon can help you, and so can others, but on another thread. I’ll start it for you. That gets to a fundamental problem with your argument. It is an argument from personal ignorance. You personally don’t know of something, so you think it does not exist. To start with, we have very low expectation that you would or should know much about a complex and vast area of biology. So declaring your ignorance is not particularly effective.
Instead, phrase it in a less aggressive way, that invites others to educate you. You will learn a lot, and it will be fun. I’ll show you how to ask in the thread I set up.