Vertebrates, including humans, have an endoskeleton. The other two types of skeletons are hydroskeletons and exoskeletons.Know More
The root word "endo-" comes from the Greek word "endon" meaning "inside or within." An endoskeleton is a skeleton that is contained inside the body, and is made up of cartilage and bones. The bones offer support and structure, while cartilage provides cushioning and flexibility. Some vertebrates, such as sharks, have a skeleton that is composed mostly of cartilage. Most vertebrates, including humans, have cartilage that is eventually replaced by bone as the body grows.
In contrast, "exo-" is derived from the word for "external or outside." Animals with an exoskeleton include grasshoppers, cockroaches, lobsters and crabs. Earthworms, jellyfish, starfish and other soft-bodied creatures have a hydroskeleton, also referred to as a hydrostatic skeleton.Learn more about Zoology
The scientific name for humans is Homo sapiens. It is thought that this species of human descended from Homo heidelbergensis. It is a myth that Homo sapiens descended from Neanderthals, who also share ancestry with Homo heidelbergensis.Full Answer >
To some degree, sharks digest food similarly to humans. Food is taken into the stomach, where enzymes and other bio-agents break it down. Once this process has been accomplished, the resulting substance is guided into the intestines; however, the shark's system has the capability to distinguish things it has ingested but which supply no nutritional value or which are too big for digestion. In these cases, the excess is expelled.Full Answer >
Some examples of parasitism include protozoans, such as amoebas, living in humans and other vertebrate species and parasitic worms that live in and cause disease in humans and animals. Parasitism is the relationship between two species of plants or animals in which one benefits at the expense of the other.Full Answer >
Aside from the fact that an array of animal species makes life on earth more interesting, protecting endangered species has important health benefits to humans. In particular, animals fit into the well-established ecological food chain, and extinction causes a disruption to natural order, according to the National Wildlife Federation.Full Answer >