Phylum Echinodermata: Class Concentricycloidea
Size of preserved xyloplax medusa is nearly:
2 cm
2 mm
3 mm
5 mm
3 mm
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Swimming larval stages in sea lilies are:A. absent
B. present
C. naked
D. hidden
Sea lilies lack the:
A. disk
B. tubes
C. arms
D. stalk
Mechanism of reproduction in sea lilies is:
A. parthenogenesis
B. asexual
C. sexual
D. unknown
Sea daisies that have been recently discovered are included in class
A. crinoidea
B. concentricycloidea
C. Holothuroidea
D. asteroidea
Number of brood pouches that hold embryo during development is:
A. 2 pairs
B. 3 pairs
C. 5 pairs
D. 1 pair
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