[Solved] The study of large body structures, visible to the naked eye, such as the heart is called anatomy. A) developmental B) microscopic C) gross D) systemic Total Income: The aggregate amount of money earned by an individual or organization from all sources before taxes or deductions. Marginal Productivity: The extra output that is produced by using one more unit of a variable input, while keeping the quantities of other inputs constant. Value of Marginal Product: The additional revenue generated by employing one more unit of a factor of production, holding other factors constant. Demand for Labor: The employers' desire for hire based on the available wages, the skill levels required, and the overall need for labor to perform tasks.