Refer to the figure, which shows alternation of generations in the life cycle of a land plant. 
In the life cycle of a plant, the spores are _______, the gametes are _______, and the zygote is _______.
Definitions:
Wage Rate
The amount of money paid to an employee by an employer in exchange for work performed, usually expressed per hour, day, or piece.
Unionization
The process of organizing workers into a union, a collective organization that negotiates with employers over wages, working conditions, and other labor issues.
Retail Trade
The selling of goods and services directly to consumers, typically in small quantities.
Marginal Labor Cost
The additional cost incurred by hiring one more unit of labor or the cost of producing one additional unit of output with an additional unit of labor.
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