According to this figure,at what time in the evolutionary history of plants did vascular systems likely first evolve? 
Definitions:
Substitute
A product or service that can be used in place of another to satisfy the same need or desire, often influencing consumer choice and market dynamics.
Discretionary Income
The amount of an individual's income that is left for spending, investing, or saving after taxes and personal necessities (like food and shelter) have been paid.
Luxurious Vacation
A high-end travel experience featuring premium accommodations, exclusive amenities, and exceptional service.
Ritz-Carlton
A luxury hotel brand known for its high level of service quality and customer care, operating globally under the Marriott International portfolio.
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