The below are exceptions to the cancellation and revision fees policy: In the event of death, of the ticketed passenger, a refund will be processed for the deceased and any traveling companion(s). Request must include a copy of the death certificate and submitted within one year of the original date of issue.
Phycomyces, a fungus, exhibiting phototropism. A tropism (from Greek ÏÏÏÏÎ¿Ï, tropos, a turning) is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.
A tropism is the manner in which a plant responds to an environmental stimulus, including light (phototropism), gravity (gravitropism) or touch (thigmotropism). Plants respond positively to some stimuli by moving toward them, and negatively to other stimuli by moving away from them.