The skeletal system supports body structures; muscular system carries out the nerve commands to produce movement.
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In much of a digestive tract such as the human gastrointestinal tract, smooth muscle tissue contracts in sequence to produce a peristaltic wave, which propels a ball of food (called a bolus while in the esophagus and upper gastrointestinal tract and chyme in the stomach) along the tract.
<span>Nearly all nutrients present in tropical rainforest forests are contained in the (soil)</span>