Hey all, this post is about evolution :) lol
In biology, evolution is the change in a population's inherited traits from generation to generation. These traits are the expression of genes that are copied and passed on to offspring during reproduction. Mutations and other random changes in these genes can produce new or altered traits, resulting in heritable differences (genetic variation) between organisms.
Or in normal language, organisms will adapt to their enviroment and will transform a little every generation.
Here are two pictures (clickable) that explains in in short!
I Love the second one!!