Answer:In 2019, the United States consumed about 31.01 trillion cubic feet (Tcf) of natural gas.
Explanation:
 
        
             
        
        
        
Answer:
Son las características que tienen los elementos y que varían en forma secuencial por grupos y períodos. Algunas de esas propiedades son: radio atómico, potencial de ionización, electronegatividad, estructura electrónica, afinidad electrónica, valencia iónica, carácter metálico
 
        
             
        
        
        
Answer:
Why wouldn't they. but why do u breathe out of your mouth
 
        
             
        
        
        
Cell membrane protects animals cells from harmful chemicals.
Explanation:
The cell membrane is a tough covering composed of the phospholipids and proteins and forms a bilayer around the cells. This acts as a semi-permeable membrane and controls the transport of ions, organic molecules and solutes to and from the cell through selective permeability.
The hydrophilic and hydrophobic properties and the corresponding polarity of the cell membrane and ionization status of the chemicals prevent the entry of harmful substances into the cell. The cell membrane functions as a barrier system and prevents the flow.