👉 An organless organism is an organism that lacks one or more essential organs. This can include organs such as the heart, lungs, liver, and kidneys, or organs in other organisms like neurons, muscles, and glands. Organless organisms are often used to study the functions of these organs or to understand how they work together within a system. They can provide insights into diseases, medical treatments, and environmental conditions that might be difficult for organisms with normal organ systems to cope with.