This is one of the biogeochemical cycles; it is entirely sedimentary, with reserves of the element coming from phosphate rock and it enters biological cycles through photosynthesis. what is the word

Answer: The phosphorus cycle

The phosphorus cycle is one of the main biochemical cycles and is essential to the existence of plants and animals. This chemical is a crucial nutrient as it is a main component of the nucleic acid structure of all life on Earth. It is also a component of energy carriers such as ATP and thus it enables cellular energy for all living organisms.

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.

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.