Explanation:
Calcium
Osteoids comprise, significant sections of the entire bone matrix, and this includes fibers of collagen which give bone its flexibility and mechanical strength this allows born to resist stretching and twisting forces.
Osteoblasts are highly specialized cells which formulate new bone through the production or secretion of parts of the organic matrix; this is referred to as the osteoid and mediate the calcification (fortification with allium) of osteoid during the formation of mature bone matrix.
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point B this is a topographic map the lines indicate the elevation of the area and B is at the lowest elevation which would be where the water would gather
Regulation is the biology theme among the choices given in the question that this example represents
The answer is "polygenetic trait."