Forsythia mermaids have a range of tails from 2-4 meters in length as a result of

genetic variation. Most mermaid tails are around 3 meters. On the reef they live on,

a new predator of the mermaid arrived and its quick speed meant only mermaids

who could maneuver quickly, those with longer tails, were able to survive. Over the

next few generations, what do you predict happened to the tail length of the

Forsythia mermaids?