In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Q: Fact1: Plants use cellulose for their cell walls., Fact2: Basically, fiber is cellulose ., Question: What is made from cell walls? (A) water (B) blood (C) cells (D) sugar (E) a path (F) fiber (G) moss (H) Carbon

A: F
****
Q: Fact1: Biodiversity increases the productivity and stability of ecosystems., Fact2: An ecosystem includes the organisms and their habitat., Question: what does biodiversity increase the productivity and stability of? (A) density (B) the looseness of soil (C) water vapor (D) the environment (E) h2o (F) swamp vegetation (G) biological diversity (H) organisms and their habitat

A: H
****
Q: Fact1: nectar is used for attracting pollinators by plants, Fact2: Birds are flowering plant pollinators., Question: What is used to attract birds to flowering plants? (A) cellulose (B) Collagen (C) chemicals (D) energy (E) seeds (F) a chime (G) nectar (H) hormones

A:
G
****