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https://youtu.be/veB31XmUQm8 The sequence of DNA that we inherit from our parents encodes directions for making our cells and giving us specific traits. Identical twins have the same DNA sequence,... read more
https://youtu.be/a3z8WBN_ey4 Mr. Key compares covalent and ionic bonds in order to explain why particles of salt are referred to as formula units and not molecules. read more
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