"I am a sequence where each number is the sum of the two before it. I appear in flower petals, shell spirals, and pine cones. I start 1, 1, 2, 3, 5, 8... What am I?"

Answer: The Fibonacci Sequence. The Fibonacci sequence begins 1, 1, 2, 3, 5, 8, 13, 21... Each number is the sum of the two preceding ones. It appears throughout nature — the number of petals on flowers, the spiral of shells, the branching of trees — all frequently follow Fibonacci numbers.