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<em>Ossification is a process in which the mesenchymal cells and cartilages convert to bone during development. it is has two types: Membranous and endochondral ossifications. It occurs in mesenchyme which has formed a membranous sheath (figure 4) .</em>
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Cardiac,Skeletal and smooth
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The proton–proton chain, also commonly referred to as the p–p chain, is one of two known sets of nuclear fusion reactions by which stars convert hydrogen to helium.
An acid is any chemical compound which when dissolved in water gives a solution with a hydrogen ion activity greater than in pure water.2<span>A </span>base<span> is an aqueous substance that can accept hydrogen ions.</span>
