Answer :
For the Lorax and the other creatures to return, the Once-ler must plant fresh trees. Someone must have cared enough to plant these trees for this to occur.
Context of the question -
Dr. Seuss's The Lorax (Random House, 1971) is a children's book about the destruction of a forest community caused by a young inventor who exhausts all of the forest's resources to meet the demand for his new invention, the need.
The youthful inventor, the Once-ler, is warned by The Lorax, who guards the forest, about what will happen if he does not care for the environment, but the Once-ler disobeys him.
The Once-ler invites his family to relocate to the forest and work in the factory with him while his business takes off. Soon, a growing number of individuals relocate to the forest. The forest suffers greatly as a result of increased population pressures and unsustainable resource utilization.
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