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

[EX Q]: A hookworm is classified as a parasite.
[EX A]: A hookworm is classified as what type of organism?

[EX Q]: Gabbro is a dark dense rock that can be found in the oceanic crust.
[EX A]: Gabbro is a dark dense rock that can be found in what?

[EX Q]: Present-day plants that have a complex vascular tissue system are called vasuluar plants.
[EX A]:
Present-day plants that have a complex vascular tissue system are called what kind of plants?