Ahypothesis is a possible answer or explanation to a scientific question based on

a. scientific laws and research that are testable.
b. scientific theories that are testable.
c. prior knowledge or research that is testable.
d. scientific laws and theories that are testable.

The correct answer is option C prior knowledge or research that is testable.

The hypothesis can be described as an educated guess, which based on the prior knowledge, theories and researches. All the theories and the researches are reproducible and testable, the hypothesis is an assumption, which is based on these researches. The hypothesis is tested and results indicate, whether the predicted hypothesis about any phenomenon is correct or not.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

thats not even an aswer choice