Which of the following characteristics is associated only with an endoskeleton? a. it allows an animal to walk. b. it consists of fluids held in a cavity. c. it grows with the animal. d. it offers protection from predators.

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.