Melting wax evaporating gasoline freezing water these changes are all examples of a) nuclear changes. b) physical changes. c) chemical changes. d) energy consumption.

All of these are changes that are not changing any of the make-up of the molecules in any fashion. they are only changing the physical state or appearance. They all are B) Physical Changes

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: