A child is trying to catch guppies at the edge of a pond with a cup. They notice that whenever their shadow crosses the water, the guppies scatter and hide. The child cleverly decides to edge around the pond so that their shadow falls behind them in order to catch some guppies. It worked! The guppies don't scatter this time and one ends up in their cup. Explain what parts of the scientific method the child used while playing at the pond.