Which of the following can you conclude about the hemoglobin in individuals with sickle cell anemia? Choose two answers that apply.
-The amino acids sequenced for the abnormal hemoglobin replaced a Glucine (Glu) for a Leucine (Leu).
-The amino acids sequenced for the abnormal hemoglobin was the same as it was for the normal hemoglobin.
-There was an error in the transcription from DNA to RNA.
-The amino acids sequenced for the abnormal hemoglobin replaced a Glucine (Glu) for a Valine (Val).
-There was an error in the nucleotide sequence in the original DNA strand.

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.

its probably to later but whats the question

c.           is the correct answer