instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
In prokaryotes, a(n) genome is composed of a single, double-stranded dna molecule in the form of a loop or circle.
answer:
In prokaryotes, what is composed of a single, double-stranded dna molecule in the form of a loop or circle?


question:
Present-day plants that have a complex vascular tissue system are called vasuluar plants.
answer:
Present-day plants that have a complex vascular tissue system are called what kind of plants?


question:
Transforming from a caterpillar to a butterfly requires a lot of energy.
answer:

Transforming from a caterpillar to a butterfly requires a lot of what?