Unlike physical products, services cannot be seen, tasted, felt, heard, or smelled before they are bought. This characteristic of services is known as . A) inseparability B) intangibility C) variability D) perishability E) heterogeneity

B, intangibility

Explanation: Intangibility as a characteristic of service means service cannot be seen, touched, smelled, heard or felt before they are bought. Example, a medical doctor about to diagnose a particular condition, the patient cannot see or smell the act of the diagnosis but rather just waits for the result.

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.