What scientific methods could you use to find out why your cactus died?

To determine why your cactus died, you could use observational methods to examine environmental factors such as light exposure, soil moisture, and temperature. Conducting a soil analysis could reveal nutrient deficiencies or pH imbalances. Additionally, you might inspect the plant for signs of pests or diseases, and consider a controlled experiment by adjusting care conditions for any remaining cacti to see if they respond differently. Finally, reviewing existing literature on cactus care could provide insights into common issues and their solutions.