The main reason is that there is no atmosphere. This means that there is no weather and no weather means that there is no wind or rain. Wind and rain are main components of erosion and because there is no erosion, craters can stay preserved for a very long time.
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Interneurons are those neurons that transduces the vague information received from the afferent neurons and sends a response to the efferent neurons.
Neurons are the basic unit of the nervous system. Hence, these nerve cells are the cells that transmits electrical impulses that causes a person to respond, move and irritable (respond to stimuli).
Number 3 and 4 are the correct answers hope this helped