The rivers of North America flow eastward or westward at the Continental Divide because it is situated along the highest points of the Rocky Mountains.
the Rocky Mountains have not yet experienced significant erosion.
the rivers mark areas of mineral deposits.
the environment was artificially altered to improve water flow to agricultural areas.

The correct answer is "b"

Hmm this is a hard heterotroph's can't produce its own food. a human can produce it's own food because people kill animals and eat them like squirrel, deer, oak trees need rain which they don't produce the rain, bee's need flowers and pollen and nectar but they don't produce it either, rabbit's don't produce either, because they either steal carrots from your garden and eat leaves.so, the best answer that i would pick is a. humanshope my answer has you and sorry if it doesn't : ) : (