The five basic stages of sleep are further classified into two distinct orders characterized by

When a person is sleeping, the body moves into 5 different stages which is characterized by a Rapid Eye Movement and a Non- Rapid Eye Movement sleep. The body usually spends 90 minutes in each of the stages. First stage is called the Transitional Phase, second stage is called a Non Rem phase, stages 3 and 4 are known as the deep stages of sleep and the 5th stage is the only Rapid Eye Movement.

B.) nitrogen fixationnitrogen fixation is the process of nitrogen molecules seeping into the soil and inside plant roots and bacteria. it gives more "life" to plants

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