Vestigial structures are taken as an example of evolution because they give us an indication of structures that, due to the adaptation to the environment, disappeared.
At the end of the vertebral column, we have the coccyx as an example of this. Its believed that it could have formed a tail and currently, is only a small bone without any specific function, even some individuals are born without it.
Explanation: Ionic bonds form when electrons are transferred, covalent bonds form when electrons are shared. polar covalent bonds form when electrons are shared unequally (basically).
When the plant is in a dark room, it cannot photosynthesize and has not enough food left for the leaves to be healthy because they need light to stay alive or otherwise they will die.
