I personally believe that there are 6 different forms of evolution commonly studied today, but only one of them is scientifically provable through verifiable visual evidence. People are free to think or believe whatever they wish, but that doesn't necessarily validate such beliefs. From what I've heard and seen, it basically breaks down like this...
Cosmic Evolution is the belief that time, space and matter originated from absolutely nothing, which somehow exploded in space billions of years ago. Scientists today refer to this event as the "Big Bang theory".
Chemical Evolution postulates that all the elements on the Periodic Table began as molecules of hydrogen and possibly helium. Basically, the theory states that all forms of matter (iron, zinc, carbon, wood, etc.) were born from different cobinations of those two elements over time, through fusion. Well, iron doesn't fuse too well, so that puts a bit of a wrench into the works. Also, you're left with a bit of a "catch 22" situation, because you'd need elements to make the stars, and stars to make the elements.
Stellar Evolution teaches that all the stars and planets in existence were all born in the Big Bang. Well, if that's really true...whey are they so drastically different? Some stars exist as nothing but balls of dust or gas, while others have genuine surfaces (such as our Moon).
Organic Evolution states that life was spontaneously born from inanimate matter, eons ago. Most diehard evolutionists will tell you we came from primordial ooze or soup...but if pressed, they'll say the soup was created by rain falling on rocks over millions of years, and it somehow came alive all by itself. Huh?!
Macro-Evolution is a theory suggesting that the animals all changed drastically from different kinds over the centuries (i.e. amoeba to fish, fish to frog, frog to bird, bird to cat, cat to ape, and ape to man (or similar ideas). One of the huge prblems with that theor is the obvious presence of animals in the world today, existing beside mankind. If all the animals evolved over time, then why are so many different kinds still here?
Micro-Evolution suggests that small variations occur within the actual kinds of animals on the planet...and it is also the only belief of these which can be conclusively proven as fact. Think about it: you have tuna, salmon, and trout, but they all have one thing in common: they're all fish. Similarly, you have lions, bobcats, tigers, and domestic felines...but they're all cats. And, it hapens with people, too. We have Caucasians, Africans, Koreans, Japanese, Chinese, Vietnamese, Native Americans, and more...but all of them are people. Variations within set kinds are the only method of evolution that's been conclusively proven, so it's the only one I believe in.
For more than a century, humans have tried to prove the existence of the other five types...and no one has ever proven their existences 100%...never. People say it, and believe it, as is their right. But that doesn't automatically mean it's true.