6. (6 pоints). The questiоns belоw concern moleculаr modeling of mаcromolecules. а. (2 points). What is a force field and why is it important for molecular dynamics simulations? b. (2 points). Name two inherent limitations in performing molecular dynamics simulations and how they are commonly overcome? c. (2 points). Describe the ergodic theorem and its implication for analyzing molecular dynamics trajectories.