5points
why do comets have tails?
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a. the sun's gravity pulls them apart.
b. comets are unstable and naturally disintegrate.
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c. earth's gravity pulls the tail toward earth.
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d. the sun vaporizes part of the ice of the comet.
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D!

Explanation:

The Sun's heat vaporizes some of the comet's material, releasing dust particles that were trapped in the ice. A combination of solar radiation pressure and solar wind blow away gas and dust from the comet's nucleus, forming two separate tails: the ion tail and the dust tail.

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