Plants need nitrogen in order to grow. Nitrogen is abundant in the earth's atmosphere, but plants cannot use it in that particular form (nitrogen gas). Certain bacteria which reside on some plant roots are able to change atmospheric nitrogen into a form that plants can use (ammonia).
Answer:
A. rarely
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The organism that has no specialized cell is Paramecium.
Paramecium are members of the phylum Ciliophora. They feed on organisms like bacteria, algae, and yeasts . These organisms uses cilia to sweep the food along with some water into the cell after it falls into the oral groove. The food then goes through the cell mouth into the gullet.
Polar PERIPHERAL MEMBRANE PROTEINS are typically found attached to the outside of a membrane.
The membrane is majorly made up of phospholipids, which are bilayer in nature, having a polar head and a non polar tail. There are two types of membrane proteins; the integral and the peripheral protein. The peripheral protein is usually found on the outside of the membrane, attached to the polar head of the phospholipid bilayer.