Excretory system, consisting of protonephridia tubes, are present in phylum:
Correct answer: C. Platyhelminthes
- A. Porifera
- B. Annelida
- C. Platyhelminthes
- D. Cnidaria
Explanation
In Platyhelminthes, protonephridia are present. Protonephridia likely first arose as a way to cope with a hypotonic environment by removing excess water from the organism (osmoregulation).
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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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