Which one of the following is a density-dependent limiting factor for a group of rattlesnakes? A) Amount of prey

B) Surrounding temperatures

C) Amount of precipitation

D) Soil quality

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.

Which direction does the energy flow in this energy pyramid ?

Which of the following is a testable hypotheses?