alleryStart learning →Amniotic eggs are used as an example of a trait that marks out a:
ASingle kingdom
BSingle individual
CSingle clade
DSingle species
Answer & Solution
Correct answer: C. Single clade
1. A shared derived trait identifies a branch of the tree.
2. All of the organisms concerned have amniotic eggs.
3. They therefore make a single clade, also called a monophyletic group.
4. A clade can contain many species, so the trait does not pick out just one.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 20 'Phylogenies and the History of Life', sections 20.1-20.3_
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