By explaining the formation of significant terrestrial ecosystems, this Rayagarden section can assist you in comprehending the origin and evolution of Angiosperm plants. Eighty percent of all plants in the world are angiosperms, which are real flowering plants. The word angiosperm translates from Greek as "vessel seed" – because the seeds produced from this classification of plant are encased and protected within an ovary (sometimes a fruit). These insect-pollinated flowering plants have been around for about 140 million years and include annual, biennial, and perennial varieties.).