[{"hint": "Set up a Punnett square with Bb × Bb.", "answer": "25% (bb)", "question": "If both parents have the genotype Bb for eye color (B = brown, b = blue), what percentage of offspring could have blue eyes?"}, {"hint": "Think about which individuals survive and reproduce more successfully.", "answer": "Organisms with favorable traits survive and reproduce more, passing those traits to offspring. Over generations, the population becomes better adapted.", "question": "Explain how natural selection leads to adaptation over time."}]