The question seem incomplete but biological principles in zoology are associated with the main features that share the members of the Animalia kingdom.
What is zoology?
Zoology is the subfield within biology that studies organisms belonging to the kingdom Animalia, i.e., animals or metazoans.
Zoology field studies metazoan organisms, which include both invertebrate organisms such as arthropods (arachnids, insects, etc) and vertebrate organisms (e.g., mammals, birds, reptiles, amphibians, fish, etc).
Animals are characterized to have motion (movement), heterotrophic habits (i.e., they need other organisms as food to survive), sexual reproduction, specialized tissues, etc.
In conclusion, biological principles in zoology are associated with the main features that share the members of this kingdom (Animalia).
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