Believe it or not, within an ecosystem is NOT transferred back and forth between all levels. Energy begins with the and flows in direction to , to , and, finally, to .

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

Explain how scientists use geologic time to determine the age of landforms.

What is the ecological role of food chains and food webs