 
 <prompt> Corn don evolve as wetin? Given di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Plants dey produce plenty different polymers like cellulose, pectin and xyloglucan wey dem use build land plant cell wall. Vascular land plants dey make lignin wey dey strengthen secondary cell walls of xylem tracheids and vessels to prevent dem from collapse when plant dey suck water through dem under water stress. Lignin dey also used for other cell types like sclerenchyma fibers wey provide structural support for plant and e dey major part of wood. Sporopollenin na strong polymer wey dey outer cell walls of spores and pollen of land plants wey help early land plant spores and pollen of seed plants survive for fossil record. E dey show say land plant evolution start for Ordovician period. Carbon dioxide for atmosphere today dey lower pass wetin e be when plants first enter land during Ordovician and Silurian periods. Many plants like maize and pineapple and some others like Asteraceae don evolve pathways like Crassulacean acid metabolism and C4 carbon fixation pathway for photosynthesis wey avoid losses from photorespiration wey dey common for C3 carbon fixation pathway. These biochemical strategies dey unique to land plants. 