instruction:
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").
question:
Fact1: Plants live just about everywhere on Earth., Fact2: Epiphytes are plants that live on other plants., Question: Where do epiphytes live? (A) swamp vegetation (B) mountains (C) vegetation (D) the environment (E) peachleaf willow (F) ice (G) rocks (H) everywhere on earth
answer:
H

question:
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
answer:
H

question:
Fact1: Echinoderms have a unique water vascular system with tube feet., Fact2: Another group of echinoderms are the echinoids., Question: Which has a unique water vascular system? (A) roots (B) trees (C) Conifers (D) Echinoids (E) fur seals (F) Most plants (G) ferns (H) bushes
answer:
D