Idade predominante dos sauropodes

When analyzing tree rings, what do scientists assume a thin ring indicates?

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.

Name the organs of humanelemintary canal.