You note a fuzzy growth on some of the food in your refrigerator. What is the name given to this step of the scientific method? O theory
law
O hypothesis
O observation
O confirmation

a

Explanation:

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.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint