TASK DEFINITION: You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
PROBLEM: The incompleteness of the fossil record results primarily from which phenomenon?  
 (A) the frequency and irregular timing of organism speciations (B) the metamorphosis of most sedimentary rock by heat and pressure (C) the geologically rapid cycling of crust material back into the mantle (D) the rarity with which organic remains are exposed to fossil-forming conditions

SOLUTION: D

PROBLEM: Rocks are classified as igneous, metamorphic, or sedimentary according to  
 (A) their color (B) their shape (C) how they formed (D) the minerals they contain

SOLUTION: C

PROBLEM: Foam weather stripping is often placed in the frames of doors and windows in a home. What is the purpose of this weather stripping?  
 (A) The weather stripping increases heat transfer by radiation. (B) Heat is conducted quickly through the weather stripping. (C) The weather stripping reduces heat loss due to convection. (D) Heat can transfer through the weather stripping due to reflection.

SOLUTION:
C