1.they are capable of dividing and renewing themselves for long peroids
2. they are unspecialized
3.they can give rise to specialized cell types
All what the word tetravalent means is that carbon can form 4 chemical bonds, due to the fact that carbon has 4 unpaired valence electrons in its furthest shell, which can be used to bond to other atoms, to form linear and cyclic structures in organic compounds.
Tetravalent also tells us indirectly what the molecular geometry of the atom would be if bonded to those number of bonds, if 4, then it would be tetrahedral and have bond angles of 109.5.
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❖ The correct answer is d. WW or Ww.
WW is dominant and is widow's peak as well as Ww. Ww is widow's peak because W is dominant and over powers the recessive trait.
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Sympathetic nervous system parasympathetic nervous system
