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Explanation:

Reason 1: Some planets, like Uranus are farther from the sun, and thus have a longer orbit, or planets closer to the sun, like mercury, have such a short year because they are so close to the sun.

Reason 2: The sun's gravitational pull is stronger on planets closer to it then farther, which is why Mercury has such a short year in comparison to Earth or Uranus.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.

gag reflex, poor dentition, gum retraction

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