TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: A covalent network solid is a compound in which all of the atoms are connected to one another by covalent bonds.

SOLUTION: What is a compound in which all of the atoms are connected to one another by covalent bonds?

PROBLEM: Activities that can reduce the effects of edema condition include exercises to keep the blood and lymph flowing through affected areas.

SOLUTION: Activities that can reduce the effects of what condition include exercises to keep the blood and lymph flowing through affected areas?

PROBLEM: The first photosynthetic organisms were not plants, but types of bacteria that lived in the water.

SOLUTION:
The first photosynthetic organisms were not plants, but types of what that lived in the water?