Being "just a theory" has to be one of the most tired things I hear about all the time
These things are widely accepted "theories" because they have been under the scrutiny of tons and tons of evidence, trial, observation, etc. to prove it
Theories evolve over time to fit what one learns
Science does not set out to PROVE something exists - that is impossible
One cannot say "All zebras are striped." We'd have to look at every zebra that ever existed, that lives now, and ever will exist. It'd be impossible. Should one stripe-less zebra roll around, that would be thrown out.
Instead, science is used to disprove all the other possibilities. The theory of evolution fits that mold - it is the fitting of it into what we know of the world. It has tons of research and evidence to back it - the only reason it is "just a theory" still is because there are millions of variables and possibilities in the world and universe. DNA may be a Earth only thing. The elements we know of may not exist elsewhere in the universe. People didn't think of such a thing of anti-matter to exist until the last 100 years and now we realize that we may very well have an entire new periodic table of antimatter. Hell, entire galaxies could be made of it and we wouldn't know.
The biggest thing about this all is that it comes down to this: Creationism is based on faith in that you have to believe what is being said is true without much to back it up except the word given to you. Evolution is something that grows and changes depending on what we find. Creationism is the end-all other possibilities solution - what is, is. Evolution, however, changes as we learn.
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