Physics
Echolocation is an adaptation bats use to

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

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Physics
When a piece of pure silicon is doped with aluminium, then

The resistivity of the doped silicon piece will increase
The conductivity of the doped silicon piece will remain the same
The doped silicon piece will become p-type
The doped silicon piece will become n-type

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