I do believe that it is C. crossing over :) I hope that is correct, it seems like the only plausible answer. 
        
             
        
        
        
A) be unable to maintain homeostasis
        
                    
             
        
        
        
DNA one is Nucleic Acid
The red is protein 
The green polygon chain is carbohydrate 
the yellow and green is lipid
        
             
        
        
        
Out of
the following given choices;
epiphyseal
plate
trabeculae
periosteum
osteon
<span>The answer is 
trabeculae.
It is the spongy part of the bone, with a honeycomb
structure. It is composed of dense collagen tissue. It is the main component of
the inner layer of bone while cortical
bone comprises mostly of the outer <span>layer</span></span>