If we are talking about one single carbon atom, then 4 hydrogen atoms can be bonded to a carbon atom, because there is 4 electrons in the valence shell, and a valence shell needs 8 electrons in total, which causes the carbon to have 4 open bonds. A hydrogen has only one electron in its valence shell of 2, and needs one more to complete it. So, each hydrogen connects to 1 of 4 bonds on the carbon to complete the valence electron.
Fun fact, CH4 is methane.
        
                    
             
        
        
        
I'm not positive but i believe it would be a ruler with millimeters and centimeters
        
                    
             
        
        
        
Answer:
yes
Explanation:
the light that a plant needs to be able to grow, has to be specific with its uv among other things
 
        
             
        
        
        
Because it’s time consuming and money consuming to observe from space so models are required
        
             
        
        
        
NAD+ accepts a hydrogen ion (H+) and two electrons (2e−), as it becomes reduced to NADH + H+. The NADH moves to the electron transport chain and donates a pair of electrons (becomes oxidized) to the first compound in the chain.
Explanation: