According to the idea of gradualism, macroevolution usually involves alternating periods…

According to the idea of gradualism, macroevolution usually involves alternating periods of stasis (no change) and rapid change. slow and gradual change. species selection. most species becoming extinct in a relatively short time. A mass extinction is the simultaneous extinction of many species. the extinction of small-sized species. something that has never been seen in the fossil record. the extinction of large-sized species.