TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Mucous does the esophagus produce for lubrication.

SOLUTION: What does the esophagus produce for lubrication?

PROBLEM: Plasmodesmata connect to cytoplasms in the plant cell.

SOLUTION: What do plasmodesmata connect to in the plant cell?

PROBLEM: Angiosperms are the most successful phylum of plants.

SOLUTION:
What are the most successful phylum of plants?