[Solved] The goal for an experiment is to demonstrate that changes in one variable are responsible for causing changes in a second variable. Abdominal Surgery: A surgical procedure carried out on organs within the abdomen, including the stomach, liver, gallbladder, and intestines. Blood Tinged Urine: Urine that contains blood, visible to the naked eye or under a microscope, indicating possible underlying medical conditions. Urinalysis: A laboratory test analyzing the content of urine for medical diagnostic purposes. Cyanosis: A bluish or purplish discoloration of the skin and mucous membranes due to insufficient oxygen in the blood.