Rob060870 said:
evolution is acually not a fact but a theory a very strong one i might add and one which i firmly believe in. theories can never be proven only strengthened by observation or other means of proof. or of course disproven which i don't believe will ever happen.
No. This is not true there is a theory of Natural Selection, which ThomasEdison has pointed out. This theory was brought about to
explain evolution.
ThomasEdison is also correct when he states that most people who are arguing against evolution bring up other theories in order to somehow discredit evolution. That's their perogative, as I said before it comes down to a misunderstanding of what the phenomena is.
To list out the most popular potential arguments used by people arguing 'against evolution':
1. Evolution doesn't show where life originated, therefore it's wrong.
This is wrong because evolution does not encompass any theories of origin of life. Evolution in a biological sense only occurs when life is existing. The theory which discusses where life on Earth originated is called
abiogenesis and it is not really a theory of biology but a theory of
chemistry. Which I'm sure your 'chemist friend' surely knows.
2. Microevolution occurs but Macroevolution doesn't.
First it's necessary to understand there is 'no such thing' as 'microevolution' and 'macroevolution'. These terms were brought into existence by creationist in order to dispute that one lifeform can, over time, change into another. You have to find out where the arbitrary cut-off point is for micro-macro evolution and why the cut-off is located at that 'point'. Normally it's speciation, however speciation has been observed plenty of times. Normally they twist the definition of species since it's not a very well defined word in biology currently but that doesn't change the fact that some level of what they would call 'macroevolution' does occur.
3. Sometimes they attempt to use mathematics in order to 'prove' that evolution could never occur.
You would have to post the specific attempt here in order for it to be deconstructed.
4. The fact that animals only give birth to animals which are like themselves disproves evolution since beneficial mutations occur very rarely.
Well since there is a plethora of observed instances of evolution there's really no point in wasting time to argue against this. If a person attempts to use this argument continues to be ignorant of observations then you're much better off not arguing with them any further.
5. The 'transitional' lifeform argument.
This is quite possibly the most infamous argument used by creationist to disprove evolution. It really doesn't follow logically it's like asking: Where does black end and white begin on a black->white gradient? Pointless question.
As you can see there are PLENTY of arguments which attempt to 'disprove evolution'. Sometimes people even say: "'insert holy scripture here' says that it didn't happen that way so that means evolution is wrong." Or sometimes they move into cosmological concerns (a branch of mostly physics) or they try to play 'moral' grounds or 'life is pointless' grounds. There is really no point in arguing with people who show gross ignorance. However if you write out the specific arguments which you are encountering and having difficultly refuting then I'll try to help you out in your refutations.
EDIT: As well just to point out the theory of Natural Selection is not the only theory to attempt an explanation of evolution but it is by far the most popular and strongest theory.