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: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Pysical weathering is the mechanical breakdown of rocks., Question: What is when rocks are broken down? (A) roof weathering (B) Plant growth is reduced (C) brick weathering (D) Physical weathering (E) remains of prehistoric life (F) at or near the margins (G) home weathering (H) major threat to health
D

Fact1: Some pelycosaurs gave rise to a group of animals called therapsids., Fact2: Pelycosaurs are an important lineage preserved in the fossil record., Question: How do we know the lineage of therapsids? (A) Laboratory (B) dinosaurs (C) prokaryotic cells (D) some anthozoans (E) fossil record (F) oral tradition (G) polygenic (H) calibrated
E

Fact1: Amphibians are the first true tetrapods, or vertebrates with four limbs., Fact2: Frogs are classified as amphibians., Question: _ are tetrapods. (A) animals (B) amoeba (C) Frogs (D) Length (E) insects (F) Spiders (G) Snakes (H) Birds
C