@cata: Hey, finally a post with content! Are you saying that if the earth has gravity, it automatically means all planets have gravity? NOW we know that they do. But if we didn't, then you couldn't make that assumption. Heck, there are a 1001 reasons why the earth could have gravity and not other plantes. Maybe the position of the earth between the sun and the stars gives it gravity. Maybe it's the moon circling around the earth that gives it gravity. We now know that it's because of the large mass that the earth has, but if we didn't know that you CAN'T MAKE THE ASSUMPTION all planets have gravity. You need to do research first. That was my point.
We didn't need to research this, really. Newton's law predicted the existence of Neptune due to gravity and the interactions of planets and stuff with it, ergo we knew it existed on all planets. Now we have General Relativity, but the reason we didn't need to test this much is mostly because space is an all encompassing thing. Anything that rings true on Earth, is true for all planets when it comes to how stuff works. ie: we know the amount of gravitational pull using the same formula for Earth on other planets. All planets have cores (because all planets have gravitational fields), etcccc.
It's pretty impossible for one planet to have a specific law specific to it and it only, and none of the others. Heliocentric theories (pretty much the only type of theory that could support such a thing you mentioned) were out of date and pretty much forgotten and not noticed well into the 18th century.
This is pretty much why they are called universal laws, even without testing it or doing research on the entire universe (in fact, we apply these laws when we haven't even explored 1% of the universe, sooo, that's definitely what I'd call a "lack of research". :P)
You can argue what you said, but it's all pretty much outdated thinking from the 4th century BC that got refuted pretty easily once we discovered that, despite our egos, no, we were not at the center of the universe. Everything else just sort of came naturally.
But people have given you content, so I don't know what your problem is!! There are variations of humans, animals do have intelligence, the problem is is you say "not as intelligent as humans" or "not a big variation" as if that refutes anything, but it doesn't. Animals have intelligence, not as smart as humans no, but they do have it. Humans do have variations, maybe not big variations but I don't exactly recall the part where evolution says "big changes". Some are big, some are small.