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Difficulty: EasyEvidence for Evolution: Paleontology and Fossil Records

Which of the following observations in the fossil record provides direct evidence that modern birds evolved from reptilian ancestors?

  1. Transitional fossils displaying both reptilian traits such as teeth and avian traits such as feathersAnswer
  2. B
    Fossils demonstrating that individual ancestral reptiles stretched their limbs and passed acquired wings to their offspring
  3. C
    Fossils showing that bird wings and insect wings share identical bone structures and embryonic origins
  4. D
    Fossils proving that complex modern organisms are only preserved in the lowest, oldest sedimentary strata

Answer

Transitional fossils displaying both reptilian traits such as teeth and avian traits such as feathers provide direct paleontological evidence for evolution.
The discovery of transitional fossils possessing anatomical characteristics of both reptiles (e.g., teeth, clawed digits) and birds (e.g., flight feathers) provides concrete physical proof in the fossil record of an evolutionary transition between the two classes.

Step-by-Step Solution

1
Identify the biological definition of fossil evidence for evolutionary lineages.
Transitional fossils (such as ArchaeopteryxArchaeopteryx) serve as intermediate forms that link ancestral taxa to descendant groups.
Paleontology relies on intermediate skeletal features preserved in sedimentary rocks to establish evolutionary pathways.
2
Evaluate the presence of diagnostic traits in fossil specimens.
Combining reptilian features (jaw teeth, long bony tail) with avian features (feathers, wishbone) confirms a shared ancestry.
Direct anatomical overlap in fossilized remains rules out independent origin.

Key Concept

Transitional Fossils as Evolutionary Evidence
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Topics

Evidence for Evolution: Paleontology and Fossil Records

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