How humans can influence ecosystem by changing the environment?

Why was the sample heated in step 5? describe the chemical principles involved in the reasoning behind this step?

How does a gymnosperm prevent itself from pollinating the same tree

(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.