"But the leaves turn yellow in the fall," said Frank, "and the trees do not die."
"The leaves of my spruce don't turn yellow in the fall," said Donald.
"They stay green all winter."
"What makes the leaves green?" asked Uncle Robert.
No one answered.
"What is the color of the potato sprouts in the cellar?"
"Yellow," said Susie.
"When you take up a board that has lain on the grass, what is the color of the grass?"
"Yellow," said Donald.
"Why?" asked Uncle Robert.
"Because they don't get any light," said Frank.