Answer:
object slows down), the way in which we calculate a drag force will be slightly different. .and “coefficient of drag , is it easy for objects to move through it 
Explanation:
 
        
                    
             
        
        
        
Answer: B. They are a first line of defense that can begin killing pathogens immediately.
Explanation:
B-lymphocytes are not the first line of defense. On the contrary, innate immune cells such as basophils, dendritic cells, eosinophils, Langerhans cells, mast cells are the body's first line of defence.
 
        
             
        
        
        
D all of these
Explanation:cus ik
        
             
        
        
        
Answer: C. Chagas disease
Explanation:
Xenodiagnosis is a method of diagnosis and detection of the microorganism responsible for infecting the tissues of the body. 
Chagas disease is a potentially life threatening disease. It is caused by the protozoan parasite called as Trypanosoma cruzi. It is transmitted to people through the feces of insects. This disease is common in South and Central America and in Mexico. The xenodiagnosis is used to detect the parasite responsible for the Chagas disease.