Animals Make a Difference to the World
The animals we call vegetables, plants, birds, mammals and fish are subkingly different from each other and have very different characteristics. A number of people who claim to be animal lovers often claim that they care about animals but really don’t. By caring so much you don’t earn their respect and in fact you hurt them by taking the cuteness out of their lives. Animals are much more complex than human beings, although humans have managed to make themselves into complete animals by developing certain organs like the eyes, nose, ears, mouth, and fingers.
Animals (called Metazoa) are eukaryotes that form the universal biological classification Animalia. With the exception of a few fossils, animals are usually composed of a body with an exoskeleton, a head, muscles, digits, nerves, skin, hair, organs, and integumentary tissues. With the exception of bacteria, animals do not require sunlight to survive. A handful of animals are classified as living only in water while many others are semi-aquatic. With the exception of algae, all other living organisms are classified into aquatic or semi-aquatic systems.
Under the taxonomy system of mammals, there are seven rank classes: Class I includes the sperm-producing germ cells, class II the ovary and menstrual stages, class III the nervous system, class IV the metamorphosis, class V the subtype of metamorphosis, class VI the form, and subtype VII the egg cell. In addition to the seven ranks, some animals belong to more than one rank. In fact, mammals are categorized as a whole tree with all classifications on the same trunk. In order to classify animals properly, it is essential to understand both the nature of their species and also their relationship to one another. We must also take into account other relevant factors such as the place of origin and the diet that they normally consume.