Planaria have a mouth, pharynx, and gastrovascular cavity with a single aperture. The planarian's mouth does not remain near its eyes. Instead, its mouth is ... |
Planarians are bilaterally symmetric and contain many complex tissue and organ systems, including photoreceptors (eyes), epidermis, muscle, a bilobed brain, ... |
NERVOUS SYSTEM: Planarians have a simple ladder-shaped nervous system. Their nerve cells are similar to those found in mammals. The spiky parts around the head ... |
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