Answer:
C.22 grams because mass cannot be created or destroyed
Explanation:
Reaction equation: 
         2H₂  +   O₂    →   2 H₂O
Mass of oxygen  = 18g
Mass of hydrogen  = 4g 
The mass of water produced is 22g according to law of conservation of mass. 
The law states that " in a chemical reaction, mass is always conserved"
  The sum of the mass of product  and reactants must always be the same.  
 
        
             
        
        
        
Answer:
False, the body systems have to work together to maintain homeostasis
Hope this helps!
 
        
                    
             
        
        
        
Answer:
The interpretation including its set of circumstances is characterized throughout the explanation segment below.
Explanation:
- Lakes that always collect a significant amount of acid rain can also have water with either a pH value very low than 4. (the latter indicates that low pH levels are much more acidic versus significantly higher.) 
- The world's oceans are covered from ocean acidification by limestone formations, which serves as a barrier to neutralize acid rain.
 
        
             
        
        
        
Plants need water to survive! They go through a process called photosynthesis where water and CO2 is converted to food. This is jmportant for the food chain because other animals eat the plants to survive as well!! Hope this helped.