A) That These Organisms Are Phenotypically More Similar to Each

question 51

Multiple Choice

A) that these organisms are phenotypically more similar to each other than to any others shown on the trees in Figure 26.2.
B) that their morphological similarities are probably homoplasies.
C) that they had a common ancestor.
D) that all three of the responses are correct.
E) that two of the responses are correct.
Answer: C
-One morphological feature of modern cetaceans is a vestigial pelvic girdle. If it is determined that cetacean lineage diverged from the artiodactyls' lineage after the divergence of pigs and other artiodactyla, then what should be true of the vestigial pelvic girdle of cetaceans?

• A) It should be considered a shared ancestral character of the cetartiodactyls.
• B) It should be considered a shared derived character of the cetartiodactyls.
• C) It should be considered a shared ancestral character of the cetaceans.
• D) It should be considered a shared derived character of the cetaceans.

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Definitions:

Inhabitants of North America

People living on the continent of North America, including indigenous peoples and descendants of settlers.

Means of Subsistence

The necessities required to support life, including food, shelter, and clothing.

Geographic Barriers

Natural features such as mountains, rivers, and deserts that present obstacles to human movement or communication.

Environmental Adaptation

The process by which organisms adjust and change their behavior, physiology, and structure to better suit their environment.