1. I know that a controlled experiment only tests one at once. •dependent variable

• independent variable

• test subject

• constant

2. I know that the is used as a comparison.

•dependent variable

• independent variable

•experimental group

•control group

1. ) A controlled experiment only tests one Independent variable at once.

2.) I know that the control group is used as a comparison.

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.

whats the answer to your question?