The Characteristics Of Four Limed Vrtebortes And Four-Limbed Vertebrates
1601 Words 7 Pages
Most four-limbed vertebrates move on all four legs. The structures at the ends of the legs are called feet. There are some four-limbed vertebrates that are bipedal which means that they can on two feet for a certain amount of time. Some walk on four feet and run on only two. Others walk and run on two but stand on four. Humans are true bipeds. This means we stand, walk, and run only on two feet.
In early four-limbed vertebrates, a basic pattern of bones was established in the limbs. It was passed on to four-limbed vertebrates that evolved later. In some of these animals, the pattern stayed much the same. However, in others, it became highly modified. In the basic pattern, the limb is divided into three segments—an upper part, a middle part, and a lower part. The upper part typically has one bone. (In the