Answer:
The answer to the question is Option C. C=C
Explanation:
Option C is a Double carbon-carbon bond. Being a double bond, it is made up of sigma bonds and pi bonds, which store more energy than single bonds and also offer added stability to the compound.
 
        
             
        
        
        
Answer:
B. are at the beginning of every food chain in a
community
make the environment suitable for complex plants
 
        
             
        
        
        
Turn off the water when it is not needed; for example, turn off the water when you brush your teeth, turn off the water when you’re scrubbing your body and hair in the shower with soap (only turn it back on when you want to rinse).
To summarize: TURN OFF THE WATER (when it’s not needed) :)