It makes no sense to ascribe "instinct" or "trial and error" to the invention of highly complex behavior such as agriculture.
It does to me. You've been gathering food all day and accidentally drop some seeds near your base and note food you used to have to forage for conveniently growing nearby. So, you plant some seeds deliberately, and get a crop. That's science - observation (the seeds grew), induction (if I plant seeds, plants will grow there), and testing. With further observation and testing, we learn about soils, fertilizers, irrigation, crop rotation, and hybrid vigor.
We tend to ascribe it to "genius" in humans and "instinct" in termites.
Human beings have intellect, the aspect of intelligence that distinguishes them from other intelligent life. Here, I am referring to the ability to think and reason in symbols like words and numbers. Termites not only lack intellect, they seem to have very little evidence of or use for consciousness. Evolution also generates innovation unconsciously.
If we and termites invented agriculture then there must be some common denominator and I'm merely suggesting it is "theory"
Both are communities that benefit from food management, but that's where the similarity ends. Only one developed agriculture consciously and deliberately.
How did ancient man and termites create new species for their own ends?
I don't think I can answer you because I still don't know what a species is to you. I think you mean they become another species when they developed agriculture.
No matter how many times I say all observed change in life and nature is sudden they continue to gainsay rather than to provide a single example. I am left to provide examples myself (like colliding galaxies) because most all believers are incapable of even trying to argue except in their own terms and their own beliefs.
The problem is the same here. I don't what sudden means to you. Here's the first definition I encountered in a search: "occurring or done quickly and unexpectedly or without warning." Andromeda will collide with the Milky Way in a few billion years, and will take millions of years to form a new galaxy. This is what you have called sudden. As I said, I don't know what that word means to you if you'll use it to describe that event, but I do know what it doesn't mean: "occurring or done quickly and unexpectedly or without warning."
That's an unusual definition [for intelligence]. I won't quibble with it but I doubt it is accurate.
The definition I provided was, "In short, it's the ability to effect short-term goals, which means knowing what causes lead to what effects and how to make them occur." That's a distillation. The larger definition also includes the ability to recognize where pitfalls and situations that can be gainfully exploited using that knowledge of how to effect outcomes are, and the evolution of one's data base and method of processing information (learning, becoming more intelligent). In its fullest form, it includes the knowledge of what will make one content, which can also be called wisdom, the most useful intelligence.
"All" people act human. Anyone who does not would have the aspect of an animal along with most unusual behavior. There is probably no human on the planet right now that doesn't act human. He sees what he believes and acts on it in accordance with his beliefs. Many have very odd beliefs.
That doesn't answer the question asked, which was, "How do you know when a mother who didn't act human produced a son or daughter who did?" nor the next question, "What's your metric for determining which genes are human? What makes mom prehuman and sonny human?" You'll need an unambiguous rule in order to decide what the first human was like and how he or she differed from it's parents that makes them nonhuman. Let's jump to the chase: that can't be done in any meaningful way.