Answer:
Coal.
Explanation:
Steam power plant has the lowest efficiency in electricity production which can only be run with the use of fossil fuels such as coal. The efficiency of this power plant is the lowest because large amount of coal is converted into smoke and other gases and very less amount of coal into heat energy. This coal is used to produce heat energy which can be used in the heating of water to produce steam. This steam is used to move turbines which turn mechanical energy into electric energy. 
 
        
             
        
        
        
Answer:
moose is the answer
Explanation:
I think I had it in my 5th grade test
 
        
             
        
        
        
<span>The information that is needed to decide weather the lower dose of the vaccine was as effective at preventing the flu for people under the age of 65 is to know weather the patient was randomly assigned the lower dose or the full dose, if there was no randomization, it could mean there was bias which affects the conclusion. If there is randomization, it leads to the ability to discover causation.</span>