1. compression a space in which particles have been spread apart 2. periodic energy an oscillating source of energy that repeats itself in a regular way 3. pulse a non-recurrent wave 4. rarefaction a space in which particles have been pushed together

Linux is distributed under gnu gpl. why is this important? a. it ensures that only torvalds can profit from the sale of linux b. it prevents unknowledgeable users from downloading programs they don't know how to operate. c. it provides protection for the developers who created linux. d. it states that anyone can copy, modify, and share the program if changes are made public.

In which of the following ways can using test-taking tips you? a. you can focus on the information that you need to study. b. you will see the answers to the test. c. you will study more. d. you will be less organized.

The footer area of a web page generally houses which website feature? terms of use web page content business name or title menu headings