Select the correct answer from each drop-down menu. Wayne is writing an article on how life may have began near hydrothermal vents. Help him complete the sentences.
During early ages, the alkaline hot liquids from the vent met the acidic cold ocean water. The acidic ocean water produced a natural (protons, electrons, neurons)
gradient across mineral wall in rocks that are rich in catalytic minerals. This difference in conditions converted (potassium, carbon dioxiode, sulfur)
and hydrogen into organic carbon-containing molecules. These can react with each other to form organic molecules, such as nucleotides and amino acids.

not too sure but maybe in the hot springs.

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.

the answer is definitely a