Wich type of symbios is each of these E. coli bacteria live in massive quantities in the large intestine of humans. They produce Vitamin K which aids in blood clotting.

Small spruce and fir trees grow in the shade of aspen trees in the forest. They would not grow as well in direct sunlight.

Bighorn sheep take in worm eggs when grazing. The worm egg hatches in the intestine and the larvae migrate to muscle tissue. When the larvae mature, they bore into capillaries and float to the lungs, where they form cysts. Large numbers of these can affect the breathing of the bighorn sheep.

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

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.