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?

Nonvascular plants are the only plants with a life cycle in which the gametophyte generation is dominant.
What are the only plants with a life cycle in which the gametophyte generation is dominant?

Sea otters are known for being playful and frisky.

What type of animals are known for being playful and frisky?