15. A disease causing agent was isolated from a human. Under the microscope, the disease causing agent is seen to be made up of a crystal-like outside. When these structures are exposed to a stain that turns blue in the presence of DNA, the middle of the structure turns blue. In the presence of living human cells, the crystal-like objects appear to increase in mass and become more numerous. In the absence of human cells or in the presence of dead cells, no changes are observed in the mass or number of crystal-like objects. [5pt] a. Using the criteria developed in class; determine whether the object is living or nonliving. b. Justify your answer. Be sure to examine each of the criteria.

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