Answer:
A.
Explanation:
 Predator-prey relations refer to the interactions between two species where one species is the hunted food source for the other. 
 
        
                    
             
        
        
        
Answer:
Hydrogen gas has the highest calorific value of 150 KJ/g among all the fuels. So, hydrogen gas is considered to be an extremely good fuel.
Explanation:
 
        
                    
             
        
        
        
I can answer when you say if you are talking about cells or no
 
        
             
        
        
        
Answer:
38.
Explanation:
All water that are present in soil is not available for the plants. Gravitation water is present in soil due to the gravitational force. The gravitation water remains for short time and cannot be consumed by the plants.
The capillary water is available to the plants and this water is attained in the soil pores. The total water present in soil sample is 100 ml. 62ml is gravitation water. The volume of capillary water = total water - gravitation water = 100 - 62 =  38ml.
Thus, the answer is 38ml.