There are choices for this question namely: 
<span>A) tonsil
B) thymus
C) Peyer's patch
D) appendix
</span>
The correct answer is "tonsil". Tonsils are lymphoid tissue that is found in the oral mucosa. The tonsils are arranged in a ring-like fashion called the Waldeyer's ring. This ring comprises of two tubal tonsils, two palatine tonsils, one adenoid tonsil, and one lingual tonsils. In cases of infection involving the oral mucosa and the pharynx, the tonsils become inflamed as well and the condition is called acute tonsillopharyngitis.
        
             
        
        
        
The plant cell is able to withstand the expansion of the central vacuole as the result of the rigid cell wall which it possess. The plant cell wall provide a rigid structure which support the activities of the cell.
        
             
        
        
        
Answer:
Theory: <u>A theory is a carefully thought-out explanation for observations of the natural world that has been constructed using the scientific method, and which brings together many facts and hypotheses.</u>
 
        
             
        
        
        
Environmental science addresses recycling strategy so we utilize our natural resources efficiently. It also provides us with knowledge on how to lead an eco-friendly lifestyle
        
                    
             
        
        
        
Birds have hollow bones due to the fact thay need to be as light as possible for their wings to generate enough lift for them to fly