Answer:
Packrats save things they find near their homes. These things include bits of leaves, seeds, or small man made items. Packrat nests have become little time capsules and show us what the environment was like at the time the packrat lived. In the dry Southwest these can last for many thousands of years so, by examining the nests, we can see environmental change over time.
Step-by-step explanation:
hope this helps! ✌