B, ocean trenches are formed after a underwater volcano has erupted.<span />
        
                    
             
        
        
        
Answer:
23 pairs nucleus parents and dna
i know that the 23 pairs is right and i also think that the rest is right to 
 
        
             
        
        
        
The parts wich are derived from these three areas include:the cerebellum,the brain stem of the brain stem consists of the parts:the midbrain,bridge brain,the medulla oblongata.other parts of the brain including the thalamus,hypothalamus and limbic device.
        
             
        
        
        
An allergy
An allergy is a disorder caused
by an abnormal reaction to a harmless antigen in the environment. These
diseases include food allergies, hay fever, atopic dermatitis and allergic
asthma. Symptoms may include, a runny nose, shortness of breath, swelling red
eyes, or sneezing. Non-allergic individuals tolerate allergens without problems.
The two main types of allergic reactions are immediate hypersensitivity and delayed
hypersensitivity.