A larger overall leave size is the answer. 
NOTE: Marking this answer as brainliest would be much appreciated! :)
        
                    
             
        
        
        
<span>The answer is D. Example
of such a relationship is that of a tick and a cow. The tick is the
ectoparasite while the cow is the host.
The tick benefits by sucking blood from the cow while the cow is disadvantaged since it is losing some of its
blood and also the tick is a vector of disease</span>
        
                    
             
        
        
        
3750 of the dominant allele. 1250 of the recessive. 50% hybrid, 25% pure dominant, and another 25% recessive.
 
        
        
        
<span>The immune system is the body's natural defense mechanism against organisms that can cause infection.There are three types of mechanisms:
1. Cellular :</span><span> refers to the recognition and/or killing of virus and virus-infected cells by leukocytes and  the production of different soluble factors (cytokines) by these cells when stimulated by virus or virus-infected cells
</span><span>
2. Structural: </span>barriers and the immune system defend the body<span> against organisms that can cause infection. </span>Natural<span> barriers include the skin, mucous membranes, tears, earwax, mucus, and stomach acid.
3. Chemical: </span><span>Some of these include the low pH of the stomach, which inhibits the growth of pathogens; blood proteins that bind and disrupt bacterial cell membranes; and the process of urination, which flushes pathogens from the urinary tract. 
</span><span>antibodies - chemical
tissues lining hollow organs - cellular
phagocytes - cellular
skin - structural
antigen - chemical
leukocytes - cellular</span>
        
                    
             
        
        
        
The motor neurons is the answer but I'm not sure