Which of the following is the first group of invertebrates that have developed a closed circulatory system?
Correct answer: C. Annelids
- A. Nematodes
- B. Arthropods
- C. Annelids
- D. Molluscs
Explanation
Annelids are the first and the only non-chordates to have a closed circulatory system.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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