instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
The long, threadlike extensions of the nerve cell help transmit nerve impulses.
answer:
Which part of the nerve cell helps transmit nerve impulses?


question:
Solid is characterized by molecules with minimal movement and strong forces between them.
answer:
Which state of matter is characterized by molecules with minimal movement and strong forces between them?


question:
Unlike energy, matter doesn’t need to be constantly added to ecosystems because it is recycled through ecosystems.
answer:

Unlike energy, what doesn’t need to be constantly added to ecosystems because it is recycled through ecosystems?