Life-cycle transformation analogy: “Tadpole : ? :: Caterpillar : Butterfly” Choose the adult form that a tadpole develops into, paralleling the metamorphosis from caterpillar to butterfly.

Introduction / Context:
Biological analogies often emphasize metamorphosis. A caterpillar undergoes metamorphosis to become a butterfly. Similarly, a tadpole is the larval stage of an amphibian that transforms into its adult form through developmental changes.

Given Data / Assumptions:

• Tadpole is the larval stage of frogs and toads (amphibians).
• Caterpillar is the larval stage of butterflies/moths (insects).
• We need the standard adult form associated with the most common example used in basics: frog.

Concept / Approach:
Mirror the relation “larva : adult.” The most basic and widely taught mapping is “tadpole → frog.” This parallels “caterpillar → butterfly.” Choosing “frog” maintains the clearest, most canonical life-cycle transformation analogy.

Step-by-Step Solution:
1) Recognize larval → adult mapping in the second pair.2) Apply the same to tadpole: select frog.3) Confirm educational convention favors frog as the standard example.

Verification / Alternative check:
Textbooks consistently present tadpole → frog as the prototypical amphibian metamorphosis. “Toad” would also be an amphibian adult, but the classical canonical pair is “frog.”

Why Other Options Are Wrong:

• Crow/Goose/Fish: Different taxa or wrong class; not amphibian adult forms of a tadpole.
• Toad: Amphibian, but the conventional schoolbook mapping is tadpole → frog.

Common Pitfalls:
Overthinking amphibian diversity; standardized tests typically expect “frog.”

Final Answer:
Frog