You might know that the domesticated (驯化的) dogs came from wolves. But you might not know how this process of transformation occurred. Wolves domesticated themselves (actual).
Surprisingly, wolves were domesticated not by the selection of humans, but by the
(amaze) adaptation of the wolves themselves to the human settlements that provided them with food. This made advantageous for wild wolves to be friendly to humans, as the friendly wolves got more food and bred more. Eventually, those friendly wolves became what we know dogs.
But while they gained safety and food, they lost independence. For example, if a dog
(present) with a locked box, it will look for human help, while a wolf will attempt (open) it. And that's not all that changed about the animal; this process even transformed their appearance.
Experiments on foxes in Siberia have found a genetic link between (friendly) and floppy ears and curled tails. The friendly foxes were those most selected by humans, and therefore had more offspring, (make) floppy ears and curly tails more common.
However, we know about domestication is still quite limited. Just think of how some people assume dogs are stupid because they are loyal even when (abuse). The truth is that the dog simply knows that being loyal to the one that feeds it will help it survive.
