Home / Everyday Science MCQs / Biology / _______ are the first group of invertebrates which have developed a closed circulatory system.

_______ are the first group of invertebrates which have developed a closed circulatory system.

A. Nematods

B. Annelids

C. Arthropods
D. Molluscs

_______ are the first group of invertebrates which have developed a closed circulatory system. | Annelids | CSS, PMS, PPSC, FPSC, KPPSC, SPSC, ISSB and NTS Past Papers | Pakistan's Largest Online Past Papers Database

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