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An organelle is a subcellular structure that has one or more specific jobs to perform in the cell, much like an organ does in the body. Among the more important cell organelles are the nuclei, which store genetic information; mitochondria, which produce chemical energy; and ribosomes, which assemble proteins.
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Acquired immunity is immunity you develop over your lifetime. It can come from: a vaccine. exposure to an infection or disease. another person's antibodies (infection-fighting immune cells
Nitrogen is the most important component of DNA, protein, enzymes etc. Its recycling in the atmosphere is necessary, beacuse free nitrogen in the atmosphere balance the atmosphere composition. In soil it is important for fertility needed for plant growth. In heterotrophs it is an essential component of organic compounds.