Examlex
Every substance that enters or leaves the internal environment of the body must cross an epithelium.
Flexible Rod
A structural element that is capable of bending or flexing under load while maintaining its integrity.
Nervous Systems
The nervous system is the complex network of nerve tissue that controls activities within the body by transmitting electrical and chemical signals between different body parts.
Essential
Absolutely necessary or extremely important for a particular process, function, or survival.
Life
A characteristic that distinguishes physical entities with biological processes, such as signaling and self-sustaining processes, from those that do not.
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