What is the purpose of this story?

Why might surface mining be less risky for miners than underground mining? a. surface miners can become trapped in a collapsed mine. b. surface miners work in dusty, enclosed areas. c. surface miners work aboveground. d. surface miners use elevators to enter mines.

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

What are the student's observations and inferences before he starts his investigation?