Two centuries ago, Tufe Peninsula became separated from the mainland, isolating on the newly formed Tufe Island a population of Turfil sunflowers  This population' s descendants grow to be, on average, 40 centimeters shorter than Turfil sunflowers found on the mainland  Tufe Island is significantly drier than Tufe Peninsula was
So the current average height of Tufe' s Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufe' s environmental conditions
There were about as many Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe Island today.