[Solved] If a product's income elasticity is - 3.4, then we can conclude that A) an increase in income will lead to an increase in demand for the product. B) the product is a normal good. C) the product is certainly a necessity. D) the product has a rising income- consumption curve. E) a decrease in income will lead to an increase in demand for the product. Umbilicus: null Physiology: The study of the function of the cells, tissues, and organs of the body. Gross Anatomy: Refers to the study of those features that can be observed with the naked eye by inspection and dissection. Cytology: The study of cell life and cell formation.