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- Behavior : The actions or reactions of an object or organism, usually in relation to a stimulus or its environment.
- Fratricide (familial) : The killing of a brother by either another brother or a sister, the Biblical tale of Cain and Abel being the most famous.
- Insect : One of numerous small arthropod animals with six legs, an exoskeleton that grows by molting, and oftentimes wings.
- Penis : A male sexual organ for transmission of semen into the female reproductive tract.
- Sex : Please do not use this term in your topic list, because there is no single article for it. Please substitute a more precise term. See Sex (disambiguation) for a list of available, more precise, topics. Please add a new usage if needed.