Multiple choice

The fact that all animals with backbones have a tail at some time during development suggests:

  1. they all still have a tail

  2. they all descended from an invertebrate

  3. they share a common ancestor

  4. they share the exact same DNA
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Shared developmental traits, such as the presence of a tail in vertebrate embryos, are homologous structures that provide evidence for a common evolutionary ancestor.

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