A class was performing an experiment to discover the pH values of some common household substances. The results of three groups are shown in the table below. Substance Group 1 pH Group 2 pH Group 3 pH Lemon juice 2.2 2.2 2.1 Vinegar 2.8 2.8 8.2 Baking soda 8.4 8.5 8.4 Milk of magnesia 10.2 10.3 10.2 Which statement best describes evidence that Group 3’s data are less valid than the data for the other two groups? Group 3’s pH value for lemon juice is lower than the values of the other two groups. Group 3’s pH value for vinegar is much higher than the values of the other two groups. Group 3’s pH value for baking soda does not exactly match the values of the other two groups. Group 3’s pH value for milk of magnesia is different from the value obtained by Group 2.

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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.

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