Which of the following statements best describes the current scientific view of birds?

• A. Birds are a separate class of animals unrelated to reptiles.
• B. Birds are mammals that developed feathers for flight.
• C. Birds are amphibians that adapted to life on land and in the air.
• D. Birds are a group of reptiles that evolved from theropod dinosaurs.

Answer: (D)

Verified step by step guidance

1. Step 1: Begin by understanding the evolutionary relationship between birds and reptiles. Birds are not a separate class of animals but are considered part of the reptile lineage due to shared characteristics and evolutionary history.
2. Step 2: Recognize that birds evolved from theropod dinosaurs, which were a group of bipedal, carnivorous dinosaurs. This connection is supported by fossil evidence, including shared traits such as hollow bones and feathers.
3. Step 3: Clarify that birds are not mammals. Mammals are characterized by features such as hair, mammary glands, and live birth, which are distinct from the traits seen in birds.
4. Step 4: Address the misconception that birds are amphibians. Amphibians are a separate group of vertebrates that typically have a dual life cycle involving aquatic and terrestrial stages, which is not applicable to birds.
5. Step 5: Conclude by emphasizing the correct scientific view: Birds are a group of reptiles that evolved from theropod dinosaurs, as evidenced by anatomical, genetic, and fossil data.