The Protostome Developmental Sequence Arose Just Once in Evolutionary History

question 21

Multiple Choice

The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups-Lophotrochozoa and Ecdysozoa. What does this finding suggest?

• A) These two subgroups have a common ancestor that was a deuterostome.
• B) The protostomes are a polyphyletic group.
• C) Division of these two groups occurred after the protostome developmental sequence appeared.
• D) The lophotrochozoans are monophyletic.

---

Definitions:

Prepare

The act of making something ready for use or consideration.

Exam

A formal test of a person's knowledge or proficiency in a particular subject or skill.

Enumerate Options

The process of listing or detailing possible choices, alternatives, or solutions systematically.

Problem Solving

The process of identifying a challenge or difficulty and finding a practical and effective solution.