Final answer:
Biological safety rules have become more stringent in recent decades due to advances in technology and research, leading to a greater understanding of potential risks and the implementation of improved control measures.
Step-by-step explanation:
In recent decades, biological safety rules have become more stringent due to advances in technology and research. These advancements have led to a greater understanding of the potential risks associated with working with biological agents. For example, scientists now have a better understanding of the modes of transmission and the potential for laboratory-acquired infections.
Improved technology has also allowed for more sophisticated control measures to be implemented, such as the use of specialized equipment and biosafety cabinets to contain dangerous organisms. Additionally, the increased awareness of the risks posed by chemical pollution and foodborne illnesses has led to government regulations aimed at controlling the use of potentially toxic substances.
Overall, the combination of advances in technology and increased awareness of potential risks has resulted in more stringent biological safety rules in recent decades.