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

[EX Q]: Antibodies recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms.
[EX A]: Which proteins recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms?

[EX Q]: A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called endoskeleton.
[EX A]: A skeleton that consists of hard, mineralized structures located within the soft tissue of organisms is called what?

[EX Q]: A moving car is said to be in dynamic equilibrium when it is zero net force.
[EX A]:
When is a moving car said to be in dynamic equilibrium?