Analogous structures have similar ______ but do not have a common developmental pathway.Multiple choice question.originsfunctionshalf-livesclocks

Step 1: Break Down the Problem

The question provides a statement about analogous structures and asks us to fill in the blank with the correct word from the multiple-choice options: origins, functions, half-lives, or clocks. We need to identify which word fits best in the context of analogous structures.

Step 2: Relevant Concepts

Analogous structures are those that perform similar functions but have evolved independently and do not share a common ancestor. This concept is important in evolutionary biology.

Step 3: Analysis and Detail

1. Origins - This term refers to the beginnings or source of something. Since analogous structures arise independently, this term seems relevant.
2. Functions - This term refers to the roles that these structures serve. While analogous structures have similar functions, the question specifies that these structures do not share a common developmental pathway, which contradicts this option.
3. Half-lives - This term is related to radioactive decay and does not connect to the concept of analogous structures.
4. Clocks - This term does not have a clear relevance to the biological context of analogous structures.

Step 4: Verify and Summarize

Given the definitions and relevance of each term, the options "origins" and "functions" are the most applicable, but because the question emphasizes the absence of a common developmental pathway, "origins" is the most appropriate choice.

Final Answer

analogous structures have similar origins but do not have a common developmental pathway.