Which One of the Following Statements Regarding the Origin of Metazoans

question 47

Multiple Choice

Which one of the following statements regarding the origin of metazoans has the most support?

• A)The choanoflagellates share features with the sponges,like having collars of microvilli surrounding a flagellum and being colonial.These shared features suggest a link to at least one metazoan lineage.
• B)Metazoans are derived from many separate lineages of unicellular organisms.
• C)Ancient metazoans,similar to members of the phylum Placozoa,have been ruled out as ancestral metazoans.
• D)Modern sponges have a genetic makeup that reflects their ancestral status.The origin of the metazoa is problematic.Morphological and functional similarities of sponges to choanocytes suggest a possible origin of that metazon lineage,however,the sponge genome is quite complex with more modern features.Placozoans have genetic features that suggest they may reflect the primitive state.

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