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Submarines use <span>buoyancy by filling ballast tanks up with water. When they are filled with water, they are more dense than the surrounding water, so they are able to sink. If they want to rise, they fill these tanks up with air so that the density is less than the water it surrounds.
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Answer: when fish is stunning it's prey it's cause electric shock to the prey that's make it die and be able to be utilized by electric eel(fish generate electric surround)
Yes. Copper, mercury, and tin are all used to fill in cavities.
Answer:
Ultraviolet light is a stronger type of light. The light the dentist uses is a softer light that is just used to help you see.
Explanation: