Physics
Echolocation is an adaptation bats use to

Find warm places for hibernation
Hunt insects in flight
Locate flowering plants
All of these

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Water in the pipes freezes and on freezing water expands, so pipes break
None of these
The material of which pipes are made contracts due to cold and so breaks
Frost makes the pipes rusty, so they break

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