Students were given various animal pictures. they were told to work in pairs, observe the animal pictures, and list some characteristics they could use to classify the animals into groups such as vertebrates and invertebrates. what characteristics do all animals have in common? a) ability to move and eat, and are single-celled b) ability to move and eat, and are multi-cellular c) ability to move and fly, and are multi-cellular d) ability to stand on four legs and eat, and are multi-cellular