Sponges and Ctenophores Have Both Been Proposed as Basal Metazoans

question 3

Multiple Choice

Sponges and ctenophores have both been proposed as basal metazoans. Imagine that you wanted to provide additional evidence to help resolve this question. Which of the following projects would be the best next step?

• A) more extensive study of DNA sequences in the bilateria
• B) ultrastructural (that is, electron microscope) comparisons of choanoflagellates and sperm cells from arthropods
• C) measurements of molecular clocks from the Lophotrochozoa
• D) more extensive studies of DNA sequences in both groups

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