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IAG_20 – OpenStax Biology 2e Instructor Answer Guide Chapter 20 Solutions 2026

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IAG_20 – OpenStax Biology 2e Instructor Answer Guide Chapter 20 Solutions 2026

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OpenStax Biology 2e Instructor Answer Guide


Biology 2e
Unit 4: Evolutionary Processes
Chapter 20: Phylogenies and the History of Life

Visual Connection Questions
1. At what levels are cats and dogs part of the same group?




Cats and dogs are part of the same group at five levels: both are in the domain Eukarya, the
kingdom Animalia, the phylum Chordata, the class Mammalia, and the order Carnivora.

2. Which animals in this figure belong to a clade that includes animals with hair? Which evolved
first, hair or the amniotic egg?




Rabbits and humans belong in the clade that includes animals with hair. The amniotic egg
evolved before hair because the Amniota clade is larger than the clade that encompasses
animals with hair.




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