Here's why Creatards might be right

[TheRocketSurgeon]

actually science doesnt explain at all WHY there are different species and different organisms all living on the same earth , now if every living thing on earth was a human then natural evolution would be logical . i am on the same earth with a squirrel so why are we so different ?

Actually science does explain why there are different species. We have explained it to you. 

Why in the world would you expect everything on earth to become human? Humanity is not the point of evolution. Surviving to reproduce DNA is the point of evolution. There are a couple of billion variations known on how DNA has done this. It diverges, it splits, and adapts to new environments and conditions all the time. We observe this happening and can demonstrate it mathematically (this is literally the topic in the second week of any course on genetics).

The Big Bang threw out a huge cloud of expanding hydrogen atoms, with a few helium ones forming along with possibly some lithium, the lightest three elements. All the rest was formed in the hearts of ancient fusion reactors called stars, which is why Sagan talks of being "made of star-stuff". 

All of this is based entirely on gravity. When enough particles get together, gravity "smashes" them enough to cause certain ones to fuse, and in that fusion process they produce heavier elements. When the star goes nova, it throws that material across the heavens. When later stars form, they have a lot of that heavier material in their environment... as the condensing cloud spins during its collapse inward, the heavier stuff is slung outward as part of a "disc" of material that forms planets. If the planet is in a zone that allows for water to exist in liquid state, as on earth, you have conditions which are right for producing organic chemistry. From that organic chemistry emerges replicating molecules... and once you have a replicator, you have a chance for the following generations to mutate, to not be exactly like the parent generation. That is the beginning of evolution. All the rest is the result of replicating under conditions that shapes what emerges via mutation (and a couple of other chemical recombinations I won't get into here) through the process of Natural Selection, as the environment and related factors determine which recombinations replicate better than others.

In that process, you get diversification and change. That is why we see all types of "answers" to the "question" of how to best replicate on this planet. There's no one right answer... there are literally billions, and nature tries them all to see what works, so to speak. (No active intelligence is operating, just the rules of chemistry and chance.)