Evolution, explained excessively simply by Clashero:
Once upon a long, long time ago, there were two kinds of giraffe. One of them had a short neck, the other had a long neck. The ones with the long necks were able to eat more, since they could reach high branches, the others starved since all their food was taken from their long-necked brothers. Therefore, only the superior, long-necked giraffes get to live and fuck and have little long-necked baby giraffes (awww)
So, that example is not true, but it sums up evolution. There's been evidence of fossiles looking like humans that get more human-like as the date of their death gets closer to the present day.
Also, why do you think some people are born without their wisdom teeth? Because they're evolving. Biology realizes they don't need them.
Once upon a long, long time ago, there were two kinds of giraffe. One of them had a short neck, the other had a long neck. The ones with the long necks were able to eat more, since they could reach high branches, the others starved since all their food was taken from their long-necked brothers. Therefore, only the superior, long-necked giraffes get to live and fuck and have little long-necked baby giraffes (awww)
So, that example is not true, but it sums up evolution. There's been evidence of fossiles looking like humans that get more human-like as the date of their death gets closer to the present day.
Also, why do you think some people are born without their wisdom teeth? Because they're evolving. Biology realizes they don't need them.