Physics
The locomotion of insects to the source of light is called :

Phototactic
Thermotactic
Phototropic
Hydrotropic

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Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of cohesion are very large
The forces of adhesion are large
The forces of cohesion of the molecules within are very much less in them

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Physics
The bats can fly in the dark because

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

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