ScienceDaily Feb. 13, 2012 ?In the wake of exam help mass extinction like the one that occurred 445 million years ago, exam help common assumption is that surviving species tend exam help proliferate quickly into new forms, having outlived many of their opponents. But new research shows that tiny marine organisms called graptoloids did not begin examination help hastily develop new actual traits until about 2 million years after competing species became extinct. The discovery demanding situations the idea that explosive evolution simply follows mass extinctions. In the absence of competition, the common theory goes, surviving species hurry examination help adapt, evolving new physical attributes exam help take capabilities of newly opened niches in the atmosphere. But that isn’t what researchers found in the fossil record of graptoloid evolution. com. 800 745 3000. I LOVE YOU, YOU’RE PERFECT, NOW CHANGE: today; Aug. 7, 9, 15, 18, 21, 25, 29 30; Sept. 1, 2 p. m.