The president of a small company needs to collect data on the educational background of all 20 of the company’s employees. Which of the following is the best method to use for data collection?.

Did the universe cool off or get hotter as it expanded after the 'big bang"?

The different layers of gases that extend form the surface of the earth into space

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome