1. What are the two types of digestion?

Mechanical digestion

Chemical digestion

Explanation:

Food is physically broken into smaller parts. For instance, by chewing.

Food is broken down by acids and enzymes into its basic units.

the speed increase from w to x due to increased gravity force

the speed decreases from x to y due to decrease in gravity

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.