Elsie C. answered 09/16/21
Elementary & Middle School Reading and Writing Tutor/Retired Teacher
When the Tucks unknowingly drink from the spring, they become immortal. Drinking from the spring is the cause. The effect is that they become immortal is the effect. Likewise, when Winnie doesn’t drink the spring water, she grows old and dies at the age of 78. So, the effect of not drinking the water keeps her mortal and allows her to age.