Can anyone please help me complete the dichotomous key attached on pg #103 for figures 1-8 on pg #102 (it is in the pdf of the textbook)? Please provide the screenshot of the answers if possible, thank you!

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.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

no i don't feel that humans have oversubscribed some medications