Examlex
Based on the octet rule,aluminum most likely forms an ________ ion.
Three-Layer Body Plan
The structural organization in animals that consists of three primary germ layers: ectoderm, mesoderm, and endoderm, which give rise to all tissues and organs of the organism.
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.
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