The event of a combobox object is triggered when the user changes the selection.?

Ryan is working on the layout of her web page. she needs to figure out where her header, navigation bar, text, and images should go. what technique can her?

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)

Explain how email technologies enable the exchange of messages between users. find out the typical parts of an email address and explain each part.