Trace fossils are recognized as evidence of what pre-existing life

Give the biological term for: structures that display characteristics of living organisms only within living cells

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.

In general, are there any major differences that you can see? explain