Which of the following are the first groups of invertebrates which have developed a closed circulatory system?
Correct answer: B. Annelids
- A. Nematodes
- B. Annelids
- C. Arthropods
- D. Molluscs
Explanation
The first groups of invertebrates which have developed a closed circulatory system are Annelids.
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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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