Let's keep this really simple. Not because you're just 16 but because sometimes it's all to easy to over complicate things.
When a Mummy and a Daddy love each other very much.... Oops, maybe not that simple
Anyway..
There are three kinds of mutations that a new born organism can exhibit, these are beneficial, benign or detrimental.
If it is a beneficial mutation that gives the organism some kind of advantage in the struggle to survive and reproduce then it is selected by nature and is far more likely to be passed on to the next generation.
If it is benign or doesn't provide much of a disadvantage or advantage then nature doesn't really pay too much attention to it.
If it is detrimental and lessens the chances of an organism reproducing then obviously it is far less likely to find its way into the next generation and probably won't survive.
Most mutations are either benign or detrimental as evolution is not consciously working towards any particular goal. It's only due to the number of offspring that organisms tend to have, too many than can possibly survive, an ever changing environment that puts pressure on life to constantly adapt and the enormity of geological time that has passed since the first primitive cell that emerged some 4 billion years ago that we have the diversity and richness of life today.
As Adrian said, the reason that many theists simply can't accept this is because they don't want to, mainly because it contradicts their literal interpretation of Genesis and so they look for any anomaly they can in the theory (Scientific theory that is), anomalies that are far, far fewer today since we have discovered and unlocked the the genetic code and proved that all life is related than existed when Darwin published his Magnum Opus 150 years ago and ever decreasing as scientists discover more and more about the workings of natural selection.
Like it or not, evolution is a proven fact and arguing against it won't change that.
When a Mummy and a Daddy love each other very much.... Oops, maybe not that simple
Anyway..
There are three kinds of mutations that a new born organism can exhibit, these are beneficial, benign or detrimental.
If it is a beneficial mutation that gives the organism some kind of advantage in the struggle to survive and reproduce then it is selected by nature and is far more likely to be passed on to the next generation.
If it is benign or doesn't provide much of a disadvantage or advantage then nature doesn't really pay too much attention to it.
If it is detrimental and lessens the chances of an organism reproducing then obviously it is far less likely to find its way into the next generation and probably won't survive.
Most mutations are either benign or detrimental as evolution is not consciously working towards any particular goal. It's only due to the number of offspring that organisms tend to have, too many than can possibly survive, an ever changing environment that puts pressure on life to constantly adapt and the enormity of geological time that has passed since the first primitive cell that emerged some 4 billion years ago that we have the diversity and richness of life today.
As Adrian said, the reason that many theists simply can't accept this is because they don't want to, mainly because it contradicts their literal interpretation of Genesis and so they look for any anomaly they can in the theory (Scientific theory that is), anomalies that are far, far fewer today since we have discovered and unlocked the the genetic code and proved that all life is related than existed when Darwin published his Magnum Opus 150 years ago and ever decreasing as scientists discover more and more about the workings of natural selection.
Like it or not, evolution is a proven fact and arguing against it won't change that.