1. The appearances of fireflies at dusk is an example of a circadian rhythm because it's happens daily. The correct option among all the options that are given in the question is the third option or option "c".
2. During migration, animals undertake a seasonal movement. The correct option among all the options that are given in the question is the first option or option "a".
        
                    
             
        
        
        
The muddiness probably made the boulder slide and the strong cali winds 
        
             
        
        
        
Protein synthesis in the ribosomes
        
             
        
        
        
Answer: D: Thylakoids
Explanation: 
Thylakoids - A flattened, membranous sac inside a chloroplast. They often exist in stacks called grana that are interconnected; their membranes contain molecular "machinery" used to convert light energy to chemical energy.
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If I were you I would choose muscles it seems right to me although I might be wrong. Hope this helped some! ;)