Because, photoautotrophs serves as their carbon sources.
Chemoheterotrophic bacteria are those bacteria that are incapable of producing their own food, they depend on photoautotrophs, which are capable of making their own food by trapping energy from the sun. Thus, photoautotrophs serves as source of food for the chemoheterotrophic bacteria.
        
             
        
        
        
Answer:
out of the cell
bc water goes towards salt
 
        
             
        
        
        
Our sun is located in the Orion arm, or the Orion spur of the milky way galaxy
        
             
        
        
        
Mercury is 46 million kilometers away from the sun