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IB Biology Exam Prep

Category - Biology

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An organism that breathes through primitive lungs, lays soft eggs, and is cold-blooded is most likely a(n) ____________.

Reptile
Amphibian
Mammal
Bird
Annelid

Explanation

Answer: B, Amphibian. Amphibians are the only species that fit the description.

Key Takeaway: While it is tempting to choose reptile as the answer, reptiles differ from amphibians in that they lay hard eggs. Birds lay hard eggs and are warm-blood. Mammals are warm-blooded and generally do not lay eggs. Annelids typically reproduce asexually and do no lay eggs.

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