Estimates of current rates of extinction suggest that rates of extinction have globally decreased, but have locally increased

suggest that one-half of all animal and plant species may be gone by the year 2100

indicate that rates may be greater than extinction rates seen in the fossil records

indicate that rates of speciation equal extinction, so an equilibrium has been reached

answer; /// i believe the name your looking for is called (plaque)or check good luck

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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.