The Protostome Developmental Sequence Arose Just Once in Evolutionary History,resulting

question 20

Multiple Choice

The protostome developmental sequence arose just once in evolutionary history,resulting in two main subgroups-Lophotrochozoa and Ecdysozoa.What does this finding suggest?

• A)These two subgroups have a common ancestor that was a protostome.
• B)The protostomes are a monophyletic group.
• C)Division of these two groups occurred after the protostome developmental sequence appeared.
• D)All of the above apply.

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Definitions:

Extraneous Variables

Variables that can influence the outcome of an experiment but are not the variables being studied.

Negative Correlation

A relationship between two variables in which one variable increases as the other decreases, and vice versa.

Qualitative Research

A research methodology that seeks to understand phenomena through the collection and analysis of non-numerical data, such as interviews and observations.

Quantitative Analyses

The process of examining numerical data to derive insights, trends, or patterns relevant to a particular study or situation.