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05/08/2021 9:10 pm
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What is true about all sponges without exception
(1) They have a mixed skeleton consisting of spicules and spongin fibres
(2) They are all marine
(3) They reproduce only asexually by budding
(4) They have flagellated collar cells
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05/08/2021 9:10 pm
(4) They have flagellated collar cells