Fact 1: Producers use energy and inorganic molecules to make food. Fact 2: Minerals are inorganic substances. Given the two facts above, what use energy and minerals to make food?

Options:
[I] trees.
[II] plant life.
[III] humans.
[IV] producers.
[V] bears.
[VI] elephants.
[VII] Most plants.
[VIII] ferns.
Answer:
[IV]