hi! producers are the main source of energy for consumers because they turn sunlight into chemical energy. without producers, no ecosystem would be able to survive because consumers would no longer have energy needed to live. hope this helps! 
 
        
             
        
        
        
Fill a graduated cylinder to 10mL, place the rock inside and calculate the difference in mL.
        
             
        
        
        
Answer:
I think B)
Explanation:
What your asking isn't that clear but if you said 'producers' is a kind of plant that creates their own food and the process is called photosynthesis. 
But at the same time your question says "this plant take in oxygen and release carbon dioxide during  just like animals and other living things" Im not sure that plants are the ones to take in oxygen and release carbon dioxide so.... 
I'm sorry if this didn't answer your question. 
 
        
             
        
        
        
Answer:
The phenotype really only depends on the parents phenotype. 
Explanation:
 
        
             
        
        
        
The elevation changes of the mountain that cause different climates and altitudes