Just as the Pleistocene was ending and Earth was warming, an event called the Younger Dryas plunged Earth back into one thousand years of cold temperatures. What is one leading hypothesis for the cause? Question 19 options:

glaciation of Antarctica

"nuclear winter" due to asteroid impact over Greenland

glaciation of the Andes and Himalaya

burial of organic carbon decreasing atmospheric CO2

tissue

explanation:

it is actually formed by geoup of cells which is tissue

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the correct answer is b

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.