Answer:
The correct option is B.
Explanation:
Dual innervation is a biochemical process by which an organ receives two different types of stimulation simultaneously. The principal function of dual innervation is to maintain the homeostatic balance of the body system. Dual innervation is brought about by two different systems, the sympathetic and the parasympathetic nerve systems. Although the actions of these two nerve systems are opposites to one another, they work together to bring balance to the body system. Without dual innervation the homeostatic system of the body can not be maintained.  
 
        
             
        
        
        
Answer:
hybrid
Explanation:
A two-gened cell is not even a thing. The answer is a hybrid animal. Hope it helps!
 
        
                    
             
        
        
        
Answer:
The correct answer is- Immune system
Explanation:
There are physical, chemical and immunological barriers present in our body which helps us to protect from the foreign antigen. They all assist each other and helps in pathogen removal from our body.
The physical barrier includes skin, gastrointestinal tract, respiratory tract, etc which do not allow the microbe to enter the body. Chemical barriers include tear, saliva, acid in the stomach which kills microbes on the body surface.
Immune cells like macrophages, B cells kills microbes when it gets in the body. Lymphatic system also contain immune cells and helps in microbe removal.  
So the immune system is assisted by physical barrier, chemical barrier, and lymphatic system.
 
        
             
        
        
        
The answers are "<span>gravitational, electric, and magnetic fields." When too electrons rub against each other that creates a electric field. Electrons often stick together which causes a gravitational, and sometimes magnetic fields.  
Hope this helps!</span>
        
             
        
        
        
Answer:
 Cnidarians have groups of similar cells that work together as tissues, while sponges have no tissues, only disconnected regions of specialized cells.