But a large amount of crystals or definite types of crystals can indicate kidney stones are at hand or that there is a dilemma with how the body is metabolizing food. Symptoms of Crystals in Urine When crystals are found in the urine it is an indication or a symptom that something is wrong in the urinary system.
A human subject is defined as a living individual about whom an investigator conducting research obtains (1) data through intervention or interaction with the individual, or (2) identifiable private information about whom includes a subjectâs opinion on a given topic.
Although most psychological research involves human subjects, some psychologists study animal subjects instead of or in addition to humans. 1  Research with animal subjects has helped psychologists do the following: 2  Learn facts about animal species. 3  Find ways to solve human problems.