Can objects in a system have momentum while the momentum of the system is zero? explain your answer.

Yes.  Momentum is a vector, so several non-zero momenta can add up to zero.  Consider for a simple example a mass of 10kg moving to the right at 5m/s, and another mass of 10kg moving to the left at 5m/s.  These momenta each have a magnitude equal to 50 kg m/s but have opposite sign and so the total system's momentum is zero.

Answerthe global climate during the paleogene departed from the hot and humid conditions of the late mesozoic era and began a cooling and drying trend which dispite having been periodically disrupted by warm periods such as the paleocene-eocene thermal maximum, persists today;