TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Protists are thought to be the oldest eukaryotes.

SOLUTION: What is thought to be the oldest eukaryotes?

PROBLEM: Diffusion process helps absorptive protists absorb food molecules across their cell membranes.

SOLUTION: Which process helps absorptive protists absorb food molecules across their cell membranes?

PROBLEM: Take care of forests of these is the best way to save animals and trees.

SOLUTION:
Which of these is the BEST way to save animals and trees?