Answer:
a country, state, or territory ruled by a king or queen.
 
        
                    
             
        
        
        
Answer:
somites
Explanation:
Embryonic development looks like a chronometer. Next to the future spine, cells are differentiated with a certain spacing that scientists call "somites." These are structures that grow, change shape. Somites will give rise to vertebrae, ribs, and axial musculature.
Somites are transient epithelial structures. These structures form early in embryonic development and originate with other important structures in the vertebrate organism.
 
        
             
        
        
        
The immune system. 
The immune system acts as a defense system of the body. It fights against bacteria, viruses and any other disease causing pathogens. Some chemicals can weaken the immune system and make them vulnerable.
        
             
        
        
        
move in a circle on a central axis.