At One Time, Chondrichthyes Were Thought to Have Split Off

question 19

Multiple Choice

At one time, Chondrichthyes were thought to have split off from other vertebrates before the evolution of bone. Now we have concluded that the Chondrichthyes split off after the evolution of bone had started. This change demonstrates ________.

• A) characteristics can be lost in evolution
• B) evolution is one-way and straight line
• C) hagfishes and lampreys have ancestors with bone
• D) cartilage contributes to keeping sharks light so they do not sink

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Definitions:

Autoethnography

A form of participant observation where the feelings and actions of the researcher become a focal point of the ethnographic study.

Life History

An approach to interviewing that asks for a chronological account of the respondent’s entire life or some portion of it.

Content Analysis

A method in which researchers identify and study specific variables or themes that appear in a text, image, or media message.

Ethnography

A qualitative research method focused on the systematic study of people and cultures from the perspective of the subject, often through participant observation and fieldwork.