The following question is based on the drawings of root or stem cross-sections shown in the figure. 
-Refer to the figure. A plant that is at least three years old is represented by ________.
Definitions:
Sleep Loss
The condition of not obtaining an adequate amount of sleep, either chronically or acutely, which can impair cognitive function and physical health.
Occasional Sleep
Periodic episodes of sleep outside the regular sleep schedule, which may arise due to various circumstances or conditions.
Physical Exercise
Physical Exercise is any bodily activity that enhances or maintains physical fitness and overall health and wellness.
Hunger-Arousing Hormone
This refers to ghrelin, a hormone produced by the stomach, which signals the brain to promote the sensation of hunger.
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