Which microscope is often used to view metal surfaces

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

(6.02 mc)what affect do marine protected areas have on environmental quality? they increase environmental quality by preventing resource overuse. they increase environmental quality by adding new species. they decrease environmental quality by removing all human activity. they decrease environmental quality by adding recycling facilities.

Why are current extinctions of concern to enviromentalists?