My Answer: Vestigial organs
Why?: " Vestigial organs are physical structures that were fully developed
and functional in an ancestral group of organisms but are reduced
and unused in the later species."
Hope I helped! :D
        
             
        
        
        
I think its called a <span>volcanic neck.</span>
        
             
        
        
        
Answer:
The thermometer can not be used to measure very low temperature
Explanation:
Mercury-in-glass thermometer is one of the types of liquid-in-glass thermometers.
Given the very melting point of mercury, it is unsuitable to attempt to use this thermometer for very low temperature measurement. 
Hence, from the melting point of mercury, this thermometer can not be used to measure very low temperature.
 
        
             
        
        
        
Answer:
skin 
Explanation:
this is one of them. it has a sense of touch skin is a organ
 
        
             
        
        
        
Answer:
D. Establish monitoring procedures
Explanation: