People are less likely to have certain bacterial infections now than they were 100 years ago.
which two practices have been developed more and more over time and have reduced cases of bacterial infection?

1refrigeration and trash collection
2trash collection and lichen use
3lichen use and dieting
4dieting and refrigeration

1 refrigeration and trash collection

Explanation:

The use of refrigeration and trash collection has reduce the incidences of bacterial infections. The refrigeration is a process which makes the substance or an area cool and maintains a particular temperature suitable for storing the food items or other materials in use. This helps in reducing the growth and colonization of bacteria. Thus the food or other items can be consumed and infection will not occur.

The trash collection can also be useful technique for collection and appropriate disposal of garbage contents. For example, disposal of non-biodegradable and biodegradable wastes should be done separately to facilitate easy and timely degradation. Specially the non-biodegradable wastes can accumulate flies, pathogens like bacteria which can contaminate the air and water. Thus special disposal techniques can help in reducing the incidences of bacterial infection.

the cell cycle is the final answer! : )

silty loam

hope this