The answer to 2-7 would be -5, but 7-2 would be 5, depends how specific one is trying to be.
Some bones develop within sheet like layers of connective tissue which are called intramembranous bones whereas the bones that are develop from a model of hyaline cartilage and are called endochondral bones.
<h3>Formation of
intramembranous bones and endochondral bones</h3>
Endochondral ossification involves the replacement of hyaline cartilage with bony tissue which leads to the formation of endochondral bones whereas, intramembranous ossification refers to the replacement of sheet-like connective tissue membranes with bony tissue which results in the formation of intramembranous bones.
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Rodolf Virchow was the scientist that studied how wounds heal and proposed that cells come from preexisting cells. Rodolf Virchow was born on 13th of October in the year 1821 and died on 5th of September in the year 1902.He was a German doctor, pathologist, anthropologist, writer, editor and politician. he was a multi faceted person. He became famous because of his discoveries regarding public health. He is also regarded as the Father of modern pathology. He was German by birth. Although he failed in containing the typhus epidemic that occurred in Upper Silesia but his report was valuable in laying the foundation for public health in Germany.