Think it's C since joints connects two bones together and marrow is inside bones. 
 
        
                    
             
        
        
        
Answer: The vulnerable embryo must be sheltered from desiccation and other environmental hazards. In both seedless and seed plants, the female gametophyte provides protection and nutrients to the embryo as it develops into the new generation of sporophyte. 
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i think this may help 
 
        
             
        
        
        
Answer:
probably because it’s either these 5 things; they want attention, they’re bored and whatever they’re doing is fun, they don’t know what’s annoying and what’s good, it’s none of these things, or its all of these things.
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Interphase is the phase in which the cell grows and develops before mitosis. This is the largest part of the cell's life span.