Nested patterns of shared similarities between species play an important role in testing evolutionary hypotheses. "Homology" is one term used to describe these patterns, but scientists prefer other, more clearly defined terms. Explore Evolution would have done well to accurately present the way scientists talk about this issue, instead of building two chapters around a misguided attack on a particular word with a meaning that dates to pre-evolutionary attempts at understanding the diversity of life.

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1. Legislation or regulations that single out evolution for restriction, ignoring other scientific topics, are unconstitutional (Epperson v. Arkansas)
2. Legislation that requires teaching evolution as "theory" or "belief" only, or that it not be taught as "fact", without defining these terms, is too vague to give real guidance to school districts and teachers about what may be taught.
   

Fig. 5.2, p. 86 from Ancient Earth, Ancient Skies, by Brent G. Dalyrmple, shows the locations of some of Earth’s oldest rocks.