Examlex
The layer of the meninges that lines the skull and vertebral canal is the:
Circulatory System
Organ system consisting of a heart or hearts and vessels that distribute circulatory fluid through a body.
Tracheal Tubes
A system of air-filled tubes in insects and some other arthropods that allow for gas exchange directly with body cells.
Spiracles
Small openings found on the surface of some animals, such as insects and spiders, that lead to their respiratory systems.
Gills
The respiratory organs of aquatic animals that extract dissolved oxygen from water and release carbon dioxide.
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Q81: The _ division of the autonomic nervous
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