This line is $1$ inch: https://cdn.kastatic.org/ka-perseus-graphie/63e1c60a37540f3e30836b01d3a563c9dc053501.svg Look at the caterpillar below. https://cdn.kastatic.org/ka-perseus-graphie/f6985822b660a216e5da732ba5062ab6d85d5aa8.svg About how long is the caterpillar?