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a
All sponges are marine.
b
All flatworms are endoparasites.
c
All arthropods are dieocious.
d
All protochordates are marine.
answer is D.
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Detailed Solution
Subphyla Urochordata and Cephalochordata are often referred to as protochordates and are exclusively marine.Spongilla is a fresh water sponge.Planaria is a free-living flatworm.Most arthropods are dioecious, but many are hermaphroditic, and some reproduce parthenogenetically.