In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

Q: Who had the first American Idol showing?, Context: The first season of American Idol debuted as a summer replacement show in June 2002 on the Fox network. It was co-hosted by Ryan Seacrest and Brian Dunkleman.

A: Fox
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Q: Which player fumbled the ball?, Context: There would be no more scoring in the third quarter, but early in the fourth, the Broncos drove to the Panthers 41-yard line. On the next play, Ealy knocked the ball out of Manning's hand as he was winding up for a pass, and then recovered it for Carolina on the 50-yard line. A 16-yard reception by Devin Funchess and a 12-yard run by Stewart then set up Gano's 39-yard field goal, cutting the Panthers deficit to one score at 16–10. The next three drives of the game would end in punts.

A: Manning
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Q: Where is that which is widely regarded as a marker for the start of land plant evolution?, Context: Plants synthesize a number of unique polymers like the polysaccharide molecules cellulose, pectin and xyloglucan from which the land plant cell wall is constructed. Vascular land plants make lignin, a polymer used to strengthen the secondary cell walls of xylem tracheids and vessels to keep them from collapsing when a plant sucks water through them under water stress. Lignin is also used in other cell types like sclerenchyma fibers that provide structural support for a plant and is a major constituent of wood. Sporopollenin is a chemically resistant polymer found in the outer cell walls of spores and pollen of land plants responsible for the survival of early land plant spores and the pollen of seed plants in the fossil record. It is widely regarded as a marker for the start of land plant evolution during the Ordovician period. The concentration of carbon dioxide in the atmosphere today is much lower than it was when plants emerged onto land during the Ordovician and Silurian periods. Many monocots like maize and the pineapple and some dicots like the Asteraceae have since independently evolved pathways like Crassulacean acid metabolism and the C4 carbon fixation pathway for photosynthesis which avoid the losses resulting from photorespiration in the more common C3 carbon fixation pathway. These biochemical strategies are unique to land plants.

A:
the outer cell walls of spores and pollen
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