51 Nutrition, Digestion, and Absorption•51.1 What Do Animals Require from Food?•51.2 How Do Animals Ingest and Digest Food?•51.3 How Does the Vertebrate Gastrointestinal System Function?•51.4 How Is the Flow of Nutrients Controlled and Regulated?http://www.allthepages.org/images/blog/bird_feeding2sm-may06.jpg
51.1 What Do Animals Require from Food? Animals are heterotrophsderive nutrition by eating other organismsAutotrophscan synthesize their necessary nutrientsheterotrophs depend on this synthesis and have adapted to take advantage of it
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