Which of the following statements about the tundra is true?
a. the tundra has a dense covering of trees.
b. there are two main categories of the tundra biome.
c. temperatures in the tundra range from extreme highs to extreme lows.
d. the tundra biome does not support animal life.

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.

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?

Which term describes a normal value for something in the body? a. homeostasis b. set point c. feedback loop d. integration center