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

Learned behavior is adaptive because they are flexible, capable of changing if the environment changes.
What kind of behaviors are adaptive because they are flexible, capable of changing if the environment changes?

Water can be boiled to kill giardia and most other pathogens.
Water can be boiled to kill giardia and most other what?

High per capita use of resources means the ecological footprint of the united states is large.
High per capita use of what means the ecological footprint of the united states is large?