sentences:  While convergent evolution is often illustrated with animal examples, it has often occurred in plant evolution.For instance, C4 photosynthesis, one of the three major carbon-fixing biochemical processes, has arisen independently up to 40 times.About 7,600 plant species of angiosperms use carbon fixation, with many monocots including 46% of grasses such as maize and sugar cane, and dicots including several species in the Chenopodiaceae and the Amaranthaceae.