Hey someone plzz can someone me what can i draw for the left squares i'm so stuck on this

Chemical change: you should probably put a log burning

Homeostasis: you should draw the human body -the lungs and this as such showing if that's your level of drawing-

Stable: you should maybe draw a human being standing on one leg and completely balanced  or in control of their body

Id help you draw these things cos i guess im pretty good *looks at the screen*  but emm that's not gonna happen -_-||

Anyways Hopefully this helps ^-^

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.