Physics
The bats can fly in the dark because

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

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Physics
Which is evidence that supports the dynamo theory?

Earth's outer core contains liquid that conducts electricity
Convection occurs in Earth's inner core
Earth's core contains a large amount of iron
Granite and basalt conduct electricity

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