Answer:
a cell splitting into two cells
Explanation:
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Kidneys and skin are part of the excretory system the bladder is part of the urinary system.
Answer:
Spongy bone consists of plates (trabeculae) and bars of bone adjacent to small, irregular cavities that contain red bone marrow. The canaliculi connect to the adjacent cavities, instead of a central Haversian canal, to receive their blood supply.