Please help me answer these questions from Diary of a young naturalist ​

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

can i get the brainliest pls

explanation:

answer; cnidarians;

because photosynthesis could not occur (apex)