Physics
Thermohaline circulation is mainly due to

Winds causing circulation of ocean water
Warm water being added to the ocean due to industial waste
Cold, dense ocean water sinking and warmer water replacing it
Warmer, less dense water sinking in the ocean and cold water replacing it

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Physics
The bats can fly in the dark because

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

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