claim: Westworld's fourth season concluded on December 4, 2016.
evidence: Shade avoidance is a set of responses that plants display when they are subjected to the shade of another plant .. shade. shade ( shadow ). It often includes elongation , altered flowering time , increased apical dominance and altered partitioning of resources .. elongation. etiolation. flowering. flowering. apical dominance. apical dominance. This set of responses is collectively called the shade-avoidance syndrome -LRB- SAS -RRB- .. shade. shade ( shadow ). Shade responses display varying strength along a continuum .. Most plants are neither extreme shade avoiders or tolerators , but possess a combination of the two strategies ; this helps adapt them to their environment .. shade. shade ( shadow ). tolerators. Shade tolerance. However , the ability to perceive and respond to shade plays a very important role in all plants  : they are sessile by nature and access to photosynthetically active radiation is essential for plant nutrition and growth .. shade. shade ( shadow ). sessile. Sessility ( botany ). photosynthetically active radiation. photosynthetically active radiation. Over the past few decades , major increases in grain yield have come largely through increasing planting densities .. As planting densities increase so does the proportion of far red light in the canopy .. Thus , it is likely that plant breeders have selected for lines with reduced SAS in their efforts to produce high yields at high density .