Answer:
A light bulb produces light from electricity
 
        
             
        
        
        
Answer: (A) Fixed interval 
Explanation:
  The fixed interval schedule is the type of schedule of the reinforcement in the operand conditioning in which the the initial response are rewarded by some specific amount of the time. 
 The main issue with the fixed interval schedule is that the people have to wait until the reinforcement schedule get occur and start their actual response of interval. This type of reinforcement schedule occur as the output value does not posses constant value all the time. 
Therefore, Option (A) is correct. 
 
        
             
        
        
        
Answer:
OC
Explanation:
I am not so sure about this though as I am not familiar with a webmail service. I hope this helped. Sorry, if it wasn't much of an help though
 
        
                    
             
        
        
        
If the ladder is not stable, it is better to have someone hold the ladder in the bottom ( only someone who is strong and confident)