From what you have learned in this chapter and in Chapter 32, do you think lungs evolved once, o

step 1 So, do we think that lungs have evolved once or on multiple occasions? So if we think about long

From what you have learned in this chapter and in Chapter...

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Key Concepts

Common Ancestry

This concept posits that traits shared among organisms often stem from a common evolutionary origin. In terms of organ evolution like lungs, if these structures are found to be homologous, it would indicate they were inherited from a common ancestor rather than having arisen independently in separate lineages.

Convergent Evolution

This key idea explains how similar traits can evolve independently in unrelated lineages due to analogous selective pressures. When considering the evolution of lungs, convergent evolution would imply that similar respiratory structures developed separately in different groups as adaptations to comparable environmental challenges.

Phylogenetic Analysis

Phylogenetic analysis uses genetic, anatomical, and fossil evidence to reconstruct the evolutionary relationships among organisms. This approach helps determine whether structures like lungs have a single evolutionary origin or have arisen multiple times independently by mapping the traits across evolutionary trees.

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