Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Toxins is contained in the skin of brightly colored poison dart frogs.
What is contained in the skin of brightly colored poison dart frogs?

Chewing insects such as dragonflies and grasshoppers have two many sets of jaws.
Chewing insects such as dragonflies and grasshoppers have how many sets of jaws?

2 pounds much can the bacteria in your gut weigh.

How much can the bacteria in your gut weigh?