. Which one of the following is a major constituent of biological membranes, nucleic acids, and cellular energy transfer systems?

Which of the following component is used to make shells, bones, and teeth by animals?

Who is the natural reservoir of phosphorous?

Which element is not released during respiration in the atmosphere?

How is the gaseous exchange of phosphorus between organisms and the environment?

Which one of the following is the simplified sequence of phosphorus cycling in a terrestrial ecosystem?

How do herbivores and other animals obtain phosphorous?

Which of the biochemical cycle is without an atmospheric component?

Which of the following is a major constituent of DNA and RNA?

Which biogenetic element is obtained from crystalline rocks?

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