Which Statement About the Biofilm Found in the Human Large

Multiple Choice

Which statement about the biofilm found in the human large intestine is false?

A) It is made up of numerous species of toxic bacteria.
B) It facilitates nutrient transfer from the intestine to the body.
C) It is essential for human health.
D) Its exact species makeup varies from region to region.
E) Humans get vitamins B₁₂ and K from the bacterial waste products.