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Lamprey larvae resembling Amphioxus demo...

Lamprey larvae resembling Amphioxus demoristrates

A

retrogressive metamorphosis

B

progressive metamorphosis

C

neoteny

D

adaptive convergence

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the question regarding the resemblance of Lamprey larvae to Amphioxus, we can break down the solution into the following steps: ### Step 1: Understand the Organisms - **Lamprey**: A jawless fish that has a larval stage known as ammocoete. - **Amphioxus**: A marine organism that is a representative of the cephalochordates, known for its simple body structure and is often used to study vertebrate evolution. ### Step 2: Identify the Developmental Stages - Both Lamprey and Amphioxus go through distinct developmental stages: egg, larva, and adult. - In Amphioxus, the larval stage is more advanced in terms of structure compared to the adult stage. ### Step 3: Define Retrogressive and Progressive Metamorphosis - **Retrogressive Metamorphosis**: This is when the larval stage is more advanced than the adult stage. In this case, the adult form becomes less modified and often less mobile. - **Progressive Metamorphosis**: This is when the larval stage develops into a more complex adult form, which is the case in Amphioxus. ### Step 4: Analyze the Options - The question presents several options regarding the characteristics of Lamprey larvae in relation to Amphioxus. - The correct option should reflect the type of metamorphosis that is observed in these organisms. ### Step 5: Conclusion - The correct answer is that Lamprey larvae demonstrate **Progressive Metamorphosis**, as they develop from a larval stage into a more complex adult form, similar to Amphioxus. ### Final Answer Lamprey larvae resembling Amphioxus demonstrate **Progressive Metamorphosis**. ---
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