Final answer:
Irregularities in the object being measured and other factors can cause irregular readings or severely depressed percent recoveries in chemistry experiments.
Step-by-step explanation:
The most common reason for irregular readings or severely depressed percent recoveries in chemistry experiments is due to irregularities in the object being measured or other factors that affect the outcome. These factors can include issues with the equipment used, contamination of the sample, or chemical reactions that occur during the measurement process.
For example, if a balance used to measure the mass of a substance is not calibrated correctly, it may give inaccurate readings. Similarly, if a sample being analyzed is contaminated with another substance, it can affect the recovery percentage. These factors can greatly impact the accuracy and reliability of experimental results.