Can someone help me with this please.

(the one with the aliens is an example)

Which are observations about the tree on the right ,? check all that apply

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine