Thumbs are called opposable because they can be moved around to touch the other fingers, giving the ability to grasp things.
This ability is shared by Old World monkeys, apes, and humans.
Hominin is the group which consists of modern humans, extinct human species and all immediate human ancestors like those in the genra Homo, Australopithecus, Paranthropus and Ardipithecus
One way in which classification is used at school is the separation of different subjects and subject materials. For instance one day you may go to a math class, while another day you may go to a french class.
When bacteria become resistant, the original antibiotic can no longer kill them. These germs that are resistant can grow, spread, and can cause infections that are hard to treat.
