I think it A because Cyanobacteria absorb co2 from the atmosphere and then release oxygen To the atmosphere
        
             
        
        
        
Your answer is B "Pituitary"
Brainliest Please
        
             
        
        
        
Human beings contribute to the phosphorus and sulfur cycles by using chemical fertilizers for the soil. This includes mostly synthetic fertilizers that can often be full of various molecules that include phosphorus and sulfur in them.
        
             
        
        
        
Sherlock Holmes is the all around good guy. therefore he is the Protagonist