1. The expression is modeling a multiplication operation. It shows that the number of bees that visit a plant is the product of the number of visits and the number of years the plant is alive.
2. The expression 500t represents the total number of bee visits that a plant would receive over time, where "t" represents the number of years the plant is alive. If we assume that the number of bee visits per year is constant, then multiplying the number of bee visits by the number of years gives us the total number of bee visits over time. In this case, the constant number of bee visits per year is 500. Therefore, the expression 500t gives us the total number of bee visits a plant would receive over "t" number of years.