Question

jupiter has retained almost all of its original atmosphere because it has strong gravity due to its high mass. it is rotating so quickly, with the highest rotation speed of any of the planets. it has no global magnetic field. ios volcanic activity adds material and replenishes the atmosphere.

Explanation:

Jupiter's large mass gives it strong gravitational pull. This strong gravity helps it hold onto its original atmosphere. Rotation speed doesn't directly relate to retaining the original atmosphere. Jupiter has a strong global magnetic - field. Io's volcanic activity affects Jupiter's magnetosphere more than retaining its original atmosphere.

Answer:

it has strong gravity due to its high mass.