Critics of sustainable agricilture claim that its farming methods will result in <u>lower crop yields</u>.
B) lower crop yields is your answer 
I hope this helps you!!!!
 
        
             
        
        
        
B. Cell membrane 
Remember cell membrane is the structure aka “wall of the house” is the clear boundary between the cells internal and external environments:)) 
Hope this helps
        
             
        
        
        
The answer is C because the load shouldnt be greater than the effort, it isnt usually, but my best answer to you would be C 
        
             
        
        
        
<span>Cast is a fossil that is a copy of an organisms shape, formed when minerals seep into a mold.
A fossil formed when an animal, plant, or other organism dies, its flesh decays and bones deteriorate due to chemical reactions; minerals gradually enter into the cavity, resulting in a cast, also called a mold fossil, which is in the general form of the original organism.</span>
        
             
        
        
        
The answer to your question isFossilized dung