1. The alternation of two or more different forms in the life cycle of a plant or animal
   - alternation of generations, xenogenesis

Type of: organic phenomenon

• Isthmus of Kra
• Isthmus of Panama
• Isthmus of Suez
• Isthmus of Tehuantepec
• Istiophoridae
• Istiophorus
• Istiophorus albicans
• Isuprel
• Isuridae
• Isurus
• Isurus glaucus
• Isurus oxyrhincus
• Isurus paucus
• Isère
• Isère River
• it
• it never rains but it pours
• it'd
• it'll
• itaconic acid
• Italia
• Italian
• Italian bee
• Italian bread
• Italian capital