It’s number 4 I believe please give me Brainlest
        
                    
             
        
        
        
C. It's necessary for the survival of the individual 
 
        
             
        
        
        
When something is cooled, its atoms compact and become more dense. vice versa for heating 
        
             
        
        
        
<u>In law of superposition which layer is the oldest and which layer is the youngest?</u>
Law of superpostion is an axiom that forms one of the bases of the sciences of geology, archaeology, and other fields dealing with geological stratigraphy.  In its plainest form, it states that in undeformed stratigraphic sequences, the oldest strata will be at the bottom of the sequence. The oldest layer would be at the bottem because of how old it is and because of how much other elemnt has been coverd on it. The younges would be on top because it is newer and just got the in the last 100  years.
If you need any help with science questions ask me and here is a picture to 
 
        
             
        
        
        
False. Mendelian genetics were based on the simple garden pea, on a plant with only 7 pair of contrasting traits. They don't take into account polygenic traits.