The study is called Ecology
        
             
        
        
        
Answer:In 2019, the United States consumed about 31.01 trillion cubic feet (Tcf) of natural gas.
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In the stomach, food undergoes chemical and mechanical digestion. Peristaltic contractions (mechanical digestion) churn the bolus, which mixes with strong digestive juices that the stomach lining cells secrete (chemical digestion). As food travels from your mouth into your digestive system, it's broken down by digestive enzymes that turn it into smaller nutrients that your body can easily absorb. This breakdown is known as chemical digestion.
        
             
        
        
        
Answer:
Epithelial cells,Muscle Cells
 muscular, skeletal organs
epithelial, connective tissue
 circulatory system organ system
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Explanation: