Dna strands are held together by hydrogen bonds. what characteristic of hydrogen bonds make them work well during dna replication? a. they are stronger than ionic bonds. b. they can be easily broken. c. they are equally as strong as covalent bonds. d. they cannot be easily broken.

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option d : from a warmer substance to a cooler substance

according to second law of thermodynamic, heat flows from higher to lower temperature region. heat is the transfer of energy from an object at higher temperature to an object at a lower temperature. so energy flows from warmer to colder objects.