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What is a characteristic unique to the majority of animals in the clade Bilateria?
What is a characteristic unique to the majority of animals in the clade Bilateria?
From which germ layer do muscle tissues and most internal organs originate in Bilateria?
From which germ layer do muscle tissues and most internal organs originate in Bilateria?
What is the term for the concentration of sensory and feeding structures in the anterior region of Bilateria?
What is the term for the concentration of sensory and feeding structures in the anterior region of Bilateria?
Which phylum is positioned as basal to other bilaterians based on molecular phylogenetic analyses?
Which phylum is positioned as basal to other bilaterians based on molecular phylogenetic analyses?
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What is the purpose of Hox genes in bilaterians during embryonic development?
What is the purpose of Hox genes in bilaterians during embryonic development?
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Which of the following is a characteristic of sedentary bilaterians, such as sessile shellfish?
Which of the following is a characteristic of sedentary bilaterians, such as sessile shellfish?
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What is the characteristic of Acoela species that allows them to digest food?
What is the characteristic of Acoela species that allows them to digest food?
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What is the term for an animal with a body that lacks shells or elaborate appendages and is usually longer than it is wide?
What is the term for an animal with a body that lacks shells or elaborate appendages and is usually longer than it is wide?
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How many phyla are included in the clade Lophotrochozoa?
How many phyla are included in the clade Lophotrochozoa?
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What is characteristic of the body plan of lophotrochozoans?
What is characteristic of the body plan of lophotrochozoans?
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What is the larval stage that some lophotrochozoans pass through?
What is the larval stage that some lophotrochozoans pass through?
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How are the relationships among lophotrochozoan phyla defined?
How are the relationships among lophotrochozoan phyla defined?
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Which of the following phyla is NOT included in the clade Lophotrochozoa?
Which of the following phyla is NOT included in the clade Lophotrochozoa?
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What is a characteristic of the body plan of flatworms?
What is a characteristic of the body plan of flatworms?
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Which of the following is a subdivision of Phylum Platyhelminthes?
Which of the following is a subdivision of Phylum Platyhelminthes?
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What is a characteristic of Catenulida flatworms?
What is a characteristic of Catenulida flatworms?
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What is the primary habitat of planarians?
What is the primary habitat of planarians?
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How do flatworms exchange gases?
How do flatworms exchange gases?
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