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Flatworm
Bilaterally symmetrical invertebrate with organs but no body cavity; for example, a planarian or tapeworm.
Simple Diffusion
The movement of molecules from an area of higher concentration to an area of lower concentration without the need for energy or a carrier.
Digestive System
The series of organs and glands responsible for the breakdown and absorption of food to extract necessary nutrients.
Respiratory System
The network of organs and tissues that help you breathe, including the lungs, trachea, and nasal passages.
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