31. Afterall, six legs are very useful to have, in the ecological niche of the insect especially. 32. As a consequence birds and even insects took over the ecological niche normally filled by mammals. 33. B . The ecological niche , from the viewpoint of functional groups, differs among species of Symbiodinium. 34. As a result, poikilotherms often have larger, more complex genomes than homeotherms in the same ecological niche . 35. When disruptive selection is based on intraspecific competition, it in turn promotes ecological niche diversification and polymorphisms. 36. They probably lived something of a rodent-like existence until their ecological niche was assumed by true rodents. 37. It is a phenomenon of divergent evolution from the large evergreen trees, for occupy another ecological niche . 38. Dinosaurs first evolved about 230 million years ago, but they were small, competing in a crowded ecological niche . 39. Nature seems to love diversity; it seldom fills an ecological niche with one species when twenty can survive. 40. That's just not our ecological niche .
