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A group containing an ancestor and all of its descendants forms a clade, also called a:
APolyphyletic group
BParaphyletic group
CAnalogous group
DMonophyletic group
Answer & Solution
Correct answer: D. Monophyletic group
1. Clades are defined by completeness of descent.
2. Organisms sharing amniotic eggs make a single clade.
3. Such a clade is also called a monophyletic group.
4. Leaving out some descendants would break the group's monophyly.
_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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