What specializations are common in the digestive tract of higher organisms such as humans?

 One is the presence of villi and microvilli in the small intestines that increase the surface area for which food is absorbed. Second is the presence of goblet cells that secrete mucus to prevent self-digestion of the tract lining. Another is the specialized enzymes in different regions of the digestive tract that specialize in digesting particular foods.

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brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

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