By the broadest definition, a body cavity is any fluid-filled space in a multicellular organism. However, the term usually refers to the space located between an animal’s outer covering (epidermis), and the outer lining of the gut cavity, where internal organs develop. "The human body cavity", normally refers to the ventral body cavity, because it is by far the largest one in volume.
Read more about Body Cavity: Grouping, Coelom, Pseudocoelom, No Coelom (Acoelomate)
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“It is cowardly to fly from natural duties and take up those that suit our taste or temperament better; but it is also unwise to take an exaggerated view of personal duties, which shuts out the proper care of the mind and body entrusted to us.”
—Ellen Henrietta Swallow Richards (1842–1911)