TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: You call the hard case that surrounds the soft parts of some animals the exoskeleton.

SOLUTION: What do you call the hard case that surrounds the soft parts of some animals?

PROBLEM: The size and symmetry of a beetle’s or an elk’s antlers or a grasshopper’s song communicate rather clearly their state of health.

SOLUTION: The size and symmetry of a beetle’s or an elk’s antlers or a grasshopper’s song communicate rather clearly their state of what?

PROBLEM: A(n) concussion is the most common type of brain injury.

SOLUTION:
What is the most common type of brain injury?