What are animals?

We have heard about animals since we were little kids. But what  xactly is the animal kingdom? First of all, an animal is an organism. But not any time of organism. An animal is an eukaryotic organism. What does this mean? It means that an animal's DNA or deoxyribonucleic acid, is contained inside a membrane-bound nucleus. This is in contrast with bacteria, for instance, where this membrane system is not found.

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The nuclear membrae in eukaryotic organisms allows for greater control of which proteins the organism can produced. This control then permits the organism to developed specialized cells, each with the same exact DNA but also with the ability to control which genes are going to be copied and used to develop tissue systems. If the cell walls were more rigid, then animals cells would not be able to have the shapes that allow for movement.

Now, there are other two kingdoms that also consist of multicellular eukaryotes. These two kingdoms are the Plant and Fungi kingdoms. So how does the animal kingdom differ from these two other kingdoms? By its members' morphology and physiology. Indeed, animals have developed muscles followed by the development of organ systems and tissue systems.

How big is the animal kingdom? There is incredible variety in both diversity and size of animals. Now, the animal kingdom represents 75% or more of the species on Earth. One reason for the survival success of animals is their mobility.