How do you think life began on Earth?

To answer your first question, evolution is not linear. Separated populations evolved to suit their environment. The Sapien branch of the primate family tree (us and our ancestors), were, through history, separated from other similar primates in breeding. This is where different species come from. Our branch split to populate grasslands more than jungles like most apes at the time. With a long, complicated, winding branch of progressive species, this population proved successful and split numerous times, the most successful sub-branches winning battles for resources and territory against other bipedal apes. When two species are too similar and populate the same region, competing for the same resources, they will almost inevitably clash and one will emerge the more successful species. This is why our bipedal ape ancestors went extinct as new genetic variations became more successful, and why our early ape ancestors, who did not share our environment, continued on their separate path of evolution, adapting to their own environment (jungles).

And to answer your second question, we HAVE evolved, remarkably quickly at that, but evolution takes a very very long time. A relatively small number of mutations occur every time we reproduce, and only a small portion of those impact future generations, and an even smaller number are beneficial mutations. Over centuries of recorded history, humans, in general, have become taller, leaner, and the average human IQ increases, a rate now calculated at roughly 3 points every 10 years. A perfect example of human evolution in progress is the sickle cell. Found in pockets of African ethnicity, their red blood cells are sickle rather than plate shaped, which gives them resistance to Malaria, a much more common disease there than here. It has the capacity to cause sickle cell anemia, but the benefits of Malaria resistance outweigh the cost from a reproductive standpoint.

These are common misunderstandings about the fundamentals of evolution. In short, evolution does not mean "better" it means "different". Natural selection dictates which creatures will reproduce and continue the species based on their beneficial characteristics for the environment in which they live.

When I was in 7th grade, I too wrote a paper explaining why evolution is false, but now that I've grown to understand the science behind it, I've come to realize that I was misled. When you ask questions, I encourage you to look for the answers from those you direct them to. More often than not, they are there.
Hope you found this helpful.

(given your response, I assume you wish to continue your assertion and the debate. Very well)
... I don't think you have any idea what you're talking about. We never "peaked" in evolutionary terms. There is no "peaking" in evolution. Whatever scientist told you that, I can assure you, hasn't got a clue what they're talking about. Evolution does not mean "better" it means "different". There is no end to the code, we are still evolving, and at a remarkable rate given our long reproductive cycle.

There are no "unprovables" in evolution that I'm aware of. If you know of any please tell me what they are, I'd like specific examples. In my experience, nothing exists in nature that cannot be explained through natural means. If you dare to bring up unprovable ideas, suggest to me how we can prove there is a god, ANY god, regardless which, that's another impossible question.

It took me a while to figure out what you were trying to get at by posting the diagram of a Laminin, and then it dawned on me that you were remarking that it looks a bit like a lumpy cross. Not only is this notion childish to be polite, but THAT is not a Laminin. THAT is a diagram of a laminin. THESE are Laminins:

A cross is a VERY common shape, but regardless how common it is, to think that a random shape in nature has spiritual importance is grossly naive. There are countless organized shapes found in nature, all naturally explainable. Take the snow-flake for example. It's mind bogglingly complex and geometrically near perfect, but we know how it is naturally produced and can replicate the process. The same can be said for the Laminin in evolutionary terms.