Question

the phylogenetic tree shown shows the evolutionary relationships among finches. what can be concluded from this diagram? a. no finches have a common ancestor. b. warbler finches and cactus finches are the most closely related. c. tree finches and warbler finches are the least closely related. d. tree finches and cactus finches have a common ancestor.

Explanation:

• Option A: Phylogenetic trees show common ancestry. All finches in the tree share a common ancestor (the base of the tree), so this option is incorrect.
• Option B: Warbler finches and cactus finches are not closely related as they are on different branches that split much earlier in the tree.
• Option C: Tree finches and warbler finches are not the least closely related. There are other finches that are more distantly related to tree finches than warbler finches.
• Option D: In a phylogenetic tree, any two groups (like tree finches and cactus finches) that branch off from the same part of the tree share a common ancestor.

Answer:

D. Tree finches and cactus finches have a common ancestor.