When an online auction site increases its number of users, then the value of the site increases for everyone. This is an example of the .

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.

2. fluorine and chlorine molecules are blamed fora trapping the sun's energyob forming acid rainoc producing smogod destroying ozone molecules

He 98 pointsss how has computers changed over the years? how can they be used now? give details and such!