Biology
Medium
Question
_______ are the first group of invertebrates which have developed a closed circulatory system.
A
Nematods
B
Annelids
✓ Official correct answer
C
Arthropods
D
Molluscs
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A
Nematods
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B
Annelids
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C
Arthropods
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D
Molluscs
No member explanations yet for this option.