The is a single, large extension from the soma.

Axon

Explanation:

Soma or cell body is one of the parts of neurons, the cells of the nervous system. Several short and branched and one large extension arise from the soma.  

The single large extension of soma is called the axon. Axon is the part of the neuron that serves to carry the nerve impulse away from soma during conduction of the impulse.  

plato users

given bodies of water

pacific / arctic / indian / southern

[ a ] the caribbean sea

[ b ] the northern ocean

[ c ] the atlantic ocean

[ d ] the barents sea

with this being the given answers