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").

Fact1: Energy is passed up a food chain or web from lower to higher trophic levels., Fact2: Plants represent the first trophic level., Question: What passes energy up the food chain to adult vegans? (A) cows (B) animals (C) Batteries. (D) chickens (E) Power companies. (F) glucose (G) Humans. (H) Plants.
H

Fact1: chemical weathering causes iron in rock to oxidize, Fact2: Oxides Oxides Oxides are elements combined with oxygen., Question: Chemical weathering causes iron in rock to combine with what? (A) uranium (B) oxygen (C) cartilage (D) nothing (E) an object (F) vacuum (G) energy (H) heat
B

Fact1: TRH stimulates the pituitary gland to produce thyroid-stimulating hormone, or TSH., Fact2: TRH synthesis is regulated directly by thyroid hormones., Question: What is TSH regulated by? (A) pituitary (B) sweating (C) animals (D) glucose (E) heat or cold (F) heat produced (G) temperature (H) organ
A