Question

what is used by scientists as evidence to develop a phylogenetic tree? drawings of extinct species only living organisms pictures of living species the fossil record

Explanation:

A phylogenetic tree shows evolutionary relationships. Fossil record provides evidence of extinct species' traits and connections, crucial for building such trees. Drawings/pictures (of extinct/living) are less reliable than actual fossil evidence. Considering only living organisms ignores evolutionary history of extinct ones.

Answer:

the fossil record