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Because Different animals have evolved different types of digestive systems specialized to meet their dietary needs. Humans and many other animals have monogastric digestive systems with a single-chambered stomach. Birds have evolved a digestive system tIngestion and digestion are two actions that occur in the alimentary canal of animals. The main difference between ingestion and digestion is that ingestion is the taking of food into the body whereas digestion is the breakdown of food into small molecules that can be absorbed by the body.that includes a gizzard where the food is crushed into smaller pieces. hope this helps have a nice night. ✨
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