TASK DEFINITION: You are given a science question (hard-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: In the geologic past, abiotic factors such as volcanic eruptions have had an impact on the availability of resources. How can volcanic eruptions impact the availability of resources?  
 (A) by decreasing the thickness of soil (B) by causing more heavy rains to erode topsoil (C) by disrupting the sunlight from reaching producers (D) by causing the surface of Earth to be warmer than usual

SOLUTION: C

PROBLEM: Scientists have discovered fossils of the same organisms in many different parts of the world. These fossils provide evidence that  
 (A) the continents were once joined together (B) most life-forms that existed in the past are still present today (C) most of Earth's surface was once covered by molten rock (D) rocks have been transformed from one type to another

SOLUTION: A

PROBLEM: Red is dominant to white for flower color in a particular plant. If a red flowered plant (RR) is crossed with a white flowered plant (rr), what color will the offspring be?  
 (A) 100% pink (B) 100% red (C) 50% white, 50% red (D) 100% white

SOLUTION:
B