The speed at which a neural impulse travels is increased when the axon is encased by a(n)

Speed increases when an axon is encased by a myelin sheath.

all soils contain mineral particles, organic matter, water and air the combinations determine the soil's properties – its texture, structure, porosity, chemistry and color. soil is made up of different-sized particles. sand particles tend to be the biggest.

answer; (c); /out to the side and directly under the dogs neck.