I urgently need you to revise this paragraph on dinosaurs. I need to simplify it using synonyms.
1) Whatever killed off (synonym??) the dinosaurs almost certainly had a bearing (I need a proper synonym) on the rest of the mass extinction, which was on a global scale and affected the flora and the fauna in both the terrestrial and the marine environments.
2) Some scientists believe the cause of the extinction of the dinosaurs was volcanic in origin whereas others believe it came from space.
2)The former suggested that a set of supervolcanic eruptions could have caused a change to the global environment.
3) The latter believed that the Earth was hit by a giant asteroid, causing firestorms and kicking up (I need a synonym) so much dust that it cut out sunlight and caused a prolonged winter period.
1) Whatever killed the dinosaurs almost certainly had an effect on all mass extinction globally, as reflected in flora and fauna on both land and sea.
2) Some scientists believe the cause of the dinosaurs' extinction was volcanic in origin, whereas others believe it came from space.
2)The former suggested that a set of supervolcanic eruptions could have caused a massive change in the global environment.
3) The latter believed that the Earth was hit by a giant asteroid, causing firestorms and producing so much dust that it cut out sunlight and caused a prolonged winter.
1) The event that wiped out the dinosaurs most likely had an impact on the rest of the mass extinction, which occurred worldwide and affected both land and marine plant and animal life.
2) Some scientists think the extinction of the dinosaurs was due to volcanic activity, while others believe it was caused by a celestial object.
3) The first group proposed that a series of massive volcanic eruptions could have altered the global environment.
4) The second group believed that the Earth was struck by a colossal asteroid, resulting in intense fires and raising so much dust that it blocked out sunlight and caused a long period of winter-like conditions.