Which of the following statements about the phosphorus cycle is true? a. in living organisms, phosphorus can be found in nucleic acids. b. phosphorus in aquatic ecosystems is only found in sediment. c. elevated levels of phosphorus in aquatic ecosystems is always beneficial. d. the soil plays no part in the phosphorus cycle. select the best answer from the choices provided

The answer is : a. In living organisms, phosphorous can be found in nucleic acids.

Option (A).

Explanation:

Phosphorus is one of the most important molecule present in the earth. The phosphorus cycle maintains the composition, quality and quantity of phosphorus on the earth.

Phosphorus is present inside the living as well as the non living organism. Phosphorus is present inside the living organism. The DNA molecule contains the phosphorus group and form the phosphodiester bonds in the DNA molecule.

Thus, the correct answer is option (A).

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explanation:

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cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!