Question

1. what feature of a phylogenetic tree shows a group of organisms that evolved from a common ancestor?

clade
tree
branch
host

Explanation:

To solve this, we analyze each option:

• A clade is defined as a group of organisms that includes an ancestor and all its descendants, which matches the description of a group evolved from a common ancestor.
• "Tree" is the overall phylogenetic tree structure, not a specific group from a common ancestor.
• A "branch" in a phylogenetic tree represents an evolutionary lineage but not specifically a group with a common ancestor and all its descendants.
• "Host" is related to symbiosis or parasitism, not phylogenetic tree groups.

Answer:

A. clade