C. living things respond to stimuli in the environment
        
             
        
        
        
<span>Synthesis means "combination or composition" or when 2 elements fuse together and the only things that are given are Mg and O2. so I believe it would produce MgO.</span>
        
             
        
        
        
The answer is B I believe it to be
 
        
                    
             
        
        
        
Seismic Waves in Earth cause earthquakes. Tectonic Plates can also cause earthquakes as they move against each other
        
             
        
        
        
A hydrometer or areometer is a <span> instrument  that always </span><span>measures the specific gravity relative density of liquids and the ratio of density of the liquid to the density of liquid to water.
Hope This Helps Have A Great Day :)))))</span>