Cells don't grow very big because they have to be able to diffuse through material easily. Also, when cells are small and plentiful they are easy to replace when damaged.
The abdominal cavity does not have a bony protection. The abdominal cavity is barely an unfilled space. It comprises a quantity of critical body organs containing the subordinate portion of the esophagus, the stomach, the small intestine, the colon, the rectum, the liver, the gall bladder, pancreas, spleen, kidneys, and bladder.
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The protonema is the part of the plant that gives rise to the gametophytes in the bryophyte plants.
</span>It gives rise to gametophyte.<span>
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