Model organisms are species that are extensively studied to understand biological processes, due to their ease of maintenance and manipulation in laboratory settings. Common examples include fruit flies, mice, and yeast. These organisms often share fundamental biological characteristics with humans, making them valuable for research in genetics, development, and disease. Researchers use model organisms to conduct experiments that would be difficult or unethical to perform on humans. By studying these organisms, scientists can gain insights into complex systems, test hypotheses, and develop new treatments for diseases. The findings from model organism studies often provide a foundation for further research in human biology and medicine.