Calculating waist to hip ratio. This is indicative of excessive fat accumulation (of a certain type) which could be indicative of a higher risk for cardiovascular diseases
        
                    
             
        
        
        
Answer: TRUE
Explanation:
Sound waves enter the OUTER EAR and travel through a narrow way up to the eardrum, where it vibrates.
The vibrations are sent to the bones of the MIDDLE EAR where they are amplified, and passed to a structure called COCHLEA in the INNER EAR. 
Finally, it reaches the sensory cells that passes it to the auditory nerve that transmit the sound to the brain as electrical signals (neural messages) for proper interpretation.
So, it is True because from OUTER EAR to MIDDLE EAR, to INNER EAR.
 
        
             
        
        
        
Answer:
carbon monoxide , nitrogen oxide water vapour ozen gases etc
 
        
             
        
        
        
Can I please have some more details, thanks