Directions: Select ALL the correct answers All living things contain carbon. Which of the following statements are true about carbon atoms?
A single molecule of some compounds can contain thousands of carbon atoms.
Each carbon atom can form single bonds with up to four other carbon atoms,
Each carbon atom can form double bonds with up to two other carbon atoms.
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Carbon atoms can join together to form chains or rings,
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2%? i tried finding the exact sorry if it's not 100% correct ; -;

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.