Al gen me ayuda es urgente

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

What element does susan b. anthony include in this passage to strengthen her argument?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above