Answer:
Option A
Explanation:
Options - 
A-avoid water pollution.
B-build thermal power plants.
C-add water features to gardens.
D-avoid drip irrigation systems
Solution - 
The largest source of freshwater on planet earth is underground water. The water beneath the surface of earth is very limited. The total fresh water reserve on earth is 3% of the total water on earth. Pollution due to discharge of waste water into the rivers and oceans has caused the degradation of not only surface water but also ground water.  
Thus, option A is correct
Drip irrigation is a means to prevent wastage of water during irrigation. Thus, avoiding it will cause further loss of fresh water.  
Addition of water feature will increase usage of water, thus it is also incorrect
Building thermal plant will also cause water pollution and wastage. Hence, option  B is also incorrect
 
        
             
        
        
        
Answer:
Less oxygen.  Less life.
Explanation:
Plants make up most of our oxygen here on earth, because of the carbon cycle and photosynthesis.  They take carbon dioxide, and turn it into oxygen.  And not only that, but some animals live in trees to protect themselves from birds and other animals. 
 
        
             
        
        
        
Answer:
Measuring heart rate and noting blood pressure is the answer. 
Explanation:
 
        
             
        
        
        
Explanation:
that's it. you are on course as shown on the screen