Physics
Ice is packed in saw dust because

Saw dust will not get melted easily.
Saw dust is poor conductor of heat.
Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.

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Physics
The bats can fly in the dark because

They can see the objects in darkness
They have weak legs and are likely to be attacked by predators
They generate flashes of light
They generate ultrasonic sound waves

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