Examlex
How did the PRI maintain control over Mexico for so long without facing significant challenges to its power? Please cite specific examples in your answer.
Body Cavity
A hollow space within the body that houses vital organs and allows for their expansion, movement, and protection.
Gastrovascular System
A simple digestive system that has a single opening through which food is ingested and waste material is excreted, found in certain invertebrates like cnidarians and flatworms.
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.
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