| Definition:
Animals are classified in the kingdom with the most complex organisms. |
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 Structure:
Among the five kingdoms of living organisms on Planet
Earth, animals are the least in number. Animals are subdivided into
nine major groups (phyla) to include many types of organisms such as sea
corals and sponges, worms, snails and starfish, insects and crabs, fish,
amphibians, reptiles, birds, and mammals.
The last five subdivisions of animals, fish, amphibians, reptiles, birds,
and mammals are vertebrates, because they
have a spinal column. The other animals are non-vertebrates.
 Function:
One of the activities of animals that distinguishes them from other kingdoms
is that animals move about in their environment. Locomotion
means moving about. Skeletal
and muscular
systems are necessary for this function.
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