Programs 9.9 and 9.10 implement a priority queue using a doubly-linked list, with dummy head and tail nodes. discuss the effect each of the following changes would have on priority queue operations (that is, list the operations that would be affected, and explain the performance effect).
a. using a singly-linked list instead of a doubly-linked list
b. not using dummy nodes
c. not maintaining a tail pointer.

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health? a. air quality data gathered by new instruments can be used to reduce exposure to pollutants. b. new technologies enable natural and human-made pollution sources to be located and monitored. c. air quality data gathered by new instruments can be used to predict trends in pollution over time. d. new technologies allow governments to make informed decisions about the regulation of pollution. (choose more than one)

Write lines of verse that rhyme to remember the following information: acid rain is a type of air pollution caused by chemicals in the air.

If your accelerator suddenly gets stuck what should you do