
A. they are the most specialized flat worms
B. they are obligate parasites
C. the progllotides contain both male and female reproductive organs
D. there are more than 2,000 species known to science
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A. they are the most primitive of multicellular animals
B. the cells in their bodies are organized into tissues and organs
C. presence of choanocytes
D. possession of sense organs
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A. enteron
B. mesoderm
C. gastrodermis
D. hyacinth
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A. Euplectella
B. Hyalonema
C. Leucoslenia
D. Spongilla
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A. Ciliated cells
B. Central tube cell
C. Nucleus
D. Eggs and sperm
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A. Demospongiae
B. Calcarea
C. Hexactinellida
D. Scloraspongiae
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A. Simplest and most primitive multicellular animals
B. Simple multicellular animals with tissues but not distinct organ
C. Parasites on a wide range of marine invertebrates
D. Adverse group of very simple bodied animals
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A. The most primitive group of cnidarians
B. Exclusively marine cnidarians
C. The amazing box jellies
D. The true jelly fish
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A. paramecium
B. stentor
C. vorticella
D. euglena
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A. Phytomastigophora
B. Demosmastigophora
C. Zoomastigophora
D. Hexactmastigophora
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