Phylogeny

AP Biology· difficulty 2/5

Group X (taxa C, D, E) plus their most recent common ancestor includes all descendants of that ancestor. This grouping is

A
$Paraphyletic$
B
$Monophyletic (a clade)$
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C
$Polyphyletic$
D
$Heterophyletic$

Explanation

A monophyletic group (clade) includes a common ancestor and ALL of its descendants. Group X contains all descendants of its common ancestor with no exclusions, qualifying as monophyletic.

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