1- four single bonds, 2- two single and one double bond, 3- one single and one t<span>riple bond, 4- two double bonds.</span>
        
             
        
        
        
The answer is coal, C.
It takes a long time to regenerate, therefore it is labelled as non renewable energy.
        
             
        
        
        
Answer:
Errors during Replication. DNA replication is a highly accurate process, but mistakes can occasionally occur as when a DNA polymerase inserts a wrong base. Uncorrected mistakes may sometimes lead to serious consequences, such as cancer. Mutations: In this interactive, you can “edit” a DNA strand and cause a mutation.
 
        
             
        
        
        
C. low humidity , when humidity is low it’s cooler outside which would be the best time for crystalline to form