Animals that have a ladder-type nervous system, consisting of two nerve cords and connecting nerves that look like a ladder, belong to the phylum:
Correct answer: E. Platyhelminthes
- A. Protozoa
- B. Coelenterata
- C. Cnidarian
- D. Porifera
- E. Platyhelminthes
Explanation
The ladder-like nervous system in flatworms features a centralized cerebral ganglion (brain) at the front, with two longitudinal nerve cords running along the body. Transverse nerves connect these cords, allowing for coordinated movement and responses to stimuli.
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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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