TASK DEFINITION: Given a scientific question, generate a correct answer to it.
PROBLEM: The four major classes of biological macromolecules include carbohydrates, lipids, proteins, and what else?

SOLUTION: nucleic acids

PROBLEM: What is the mass of one mole of any given substance?

SOLUTION: molar mass

PROBLEM: What carries warm or cold water throughout the world's oceans?

SOLUTION:
ocean currents