Examlex
The exchange of carbon dioxide and oxygen between the blood and the cells is called ________.
Identical Twins
Twins that result from the division of a single fertilized egg, sharing the same genetic material and typically exhibiting very similar physical and sometimes behavioral traits.
Temporary Center
A transient focal point or hub characterized by a particular activity or function, which is not permanent.
Blood Cells
Components of blood, including red cells carrying oxygen, white cells defending against infection, and platelets aiding in clotting.
Yolk Sac
One of the extraembryonic membranes; a pouchlike outgrowth of the digestive tract of embryos of certain vertebrates (e.g., birds) that grows around the yolk and digests it. Embryonic blood cells are formed in the mammalian yolk sac, which lacks yolk.
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