Answer:
Sensory neurons
Explanation:
Neurons are specialized somatic cells which are responsible of conveying stimuli from the enviroment.
They are made up of three parts; cell body, dendrites and an axon.
Sensory neurons are one of the three types of neurons.
They are responsible of carrying stimuli from external body parts to the central nervous system.
On the other hand, motor neurons carries signals from the brain to other body organs.
The third type is called interneuron, it is located in the brain and nowhere else. It acts as a linkage between other neurons and the brain.
 
        
                    
             
        
        
        
Answer:
C
Explanation:
D in my opinion wouldn't be correct because a vaccine is for if you come in contact with the sickness you are more protected and helps build immunity. So healthy people get them to try and build immunity against said vaccine. Like if you have the flu, your body is fighting. In the Flu vaccine parts of the flu are in the vaccine to help your body learn to become immune. So option C. 
Sorry if this is confusing, hope it helps!
 
        
                    
             
        
        
        
An epoch is longer than an era.