Sunlight
solar energy
water
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.
Mitosis is the process of making cells for humans, plants, animals.
Meiosis is the process of making sex cells for humans and animals.
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Hello.There are 5 levels of cell organization recognized by biologists The 5 levels consist of :
1) cells
2) tissues
3) organs
4) organ system
5) organism
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