You really need an explanation for feature or transitional fossil
I need an explanation of EXACTLY what YOU mean by it, in precise terms, with no wiggle room and no secret exits.
Are you ready to explain the cambrian now that you know what it is and what it presented ?
I always knew. I already explained it: your notion that the Cambrian explosion happened instantaneously is non-factual. It didn't. It was simply a period of unusually rapid evolution. So the only thing to explain (if anything at all) is that evolution does not proceed at a constant speed. Do you need that explained?
How bout,non-intelligence creating intelligence ?
Well, first we have to define intelligence and how it works. If you really want an explanation of this, follow along.
The root operation of intelligence is simply trial and error. It presumes a preferred outcome, which for living things is (at simplest level) survival. Do A. If A works, live. If A doesn't, die.
Now let's suppose a large group of living things (one-celled organisms in this case). Let's say they are faced with choices between two actions in a given situation and make those choices randomly. Those that choose A live. Those that choose B die. Now let's recognize also, because this is true, that a predilection to choose A instead of B can be encoded into the genes. Further, let's posit that a certain percentage, say 10%, are coded to prefer A, while another 10% are coded to prefer B, and the remaining 80% are coded to prefer neither. Over time, those coded to prefer A will replace the population coded to prefer B or neither, because they will survive and pass on their genes more reliably. Eventually, the entire population will be genetically programmed to prefer A.
So there we have the simplest, most basic form of intelligence: a genetic, instinctive preference to make a particular decision. There's a lot of that in nature. We're not up to what we would call intelligence proper, yet, but bear with me.
Now let's skip a few steps, because to have intelligence as that term is normally meant we need a multicelled organism. (I can explain how that happens, too. It's not nearly as mysterious as you seem to think. But I'll skip it for now.) All right, we have multicelled organisms and the beginning of differentiation, with some cells specializing in some functions and other cells in other functions. Again, I'm skipping steps, but none of this presents any problem at all to evolutionary theory.
One of the advances likely to happen because it presents a clear survival advantage is the development of specialized nerve tissue, which makes the processing of information and sensing of the environment more efficient. We're still not up to intelligence properly so called, but now we have information coming to the organism for it to act upon. It still makes decisions by random trial and error, "learning" over generations and "deciding" by instinct, but does so more efficiently. But specialized nerve tissue allows for another advance: memory. Memory means that the organism can recall what it did on a prior decision and whether or not it worked. So instead of making a new random decision each time, it can make a random decision once, and if that works out remember and make the same decision (no longer random) next time. This gives it a big survival advantage, so memory is kept and passed on to future generations.
Now, over time and generations, more nerve tissue is given over to the functions of sensation and memory (natural selection alone can do this, no mutations needed at this stage). And at some point, we add a new refinement: imagination. The organism comes upon a situation that isn't exactly like anything it's met before, but enough like it that it can extrapolate. Instead of just barging ahead and doing A or B, it imagines doing both, imagines the outcome (in which it may be right or wrong), and chooses in real life whichever approach it imagines will be better. And again, over time and generations, its descendants become better at doing this through a process of natural selection.
So let's review what we have so far:
1) Basic trial and error decision making leads to instinctive knowledge.
2) Multicelled organization leads to specialized nerve tissue.
3) Specialized nerve tissue leads to memory.
4) Memory leads to imagination, and the making of decisions by imaginary trial and error rather than the real thing.
And there we have the basis for intelligence. Everything else is just refinement and improvement.
That's how evolution works, not in one huge jump but in many smaller increments, each opening new possibilities.
