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Blood levels of the pineal hormone melatonin are high at night and low during the day. Its secretion is regulated by a rhythm-generating system located in the suprachiasmatic nucleus of the hypothalamus, which is in turn regulated by light.

An NPN transistor turns on when the current flows through the base of the transistor.
The NPN transistor consists of two n-type semiconductors that sandwich a p-type semiconductor.
Here, electrons are the majority charge carriers, while holes are the minority charge carriers

The working of PNP transistor is the exact opposite to the NPN transistor.
In a PNP transistor, the base current which enters into the collector is amplified. The flow of current is typically controlled by the base.
Current flows in the opposite direction in the base.

A common nitrate test, known as the brown ring test can be performed by adding iron(II) sulfate to a solution of a nitrate, then slowly adding concentrated sulfuric acid such that the acid forms a layer below the aqueous solution.

Alveoli is the structural and functional unit of lungs. The main function of the respiratory system is the exchange of oxygen from the atmosphere for carbon dioxide produced by the cells of the body. Other functions of the respiratory system include participation in the acid-base balance of the body, phonation, pulmonary defense, and metabolism.

Accuracy in metrology is the agreement of the result of a measurement with the true value of the measure quantity.
Accuracy is the value near to the true value.
Therefore the option is C.

Precision is Repeatability of a measuring process.
Precision refers to how close measurements of the same item are to each other.
Precision is independent of accuracy.
That means it is possible to be very precise but not very accurate, and it is also possible to be accurate without being precise.
The best quality scientific observations are both accurate and precise.

Precision of measuring equipment is the closeness with which a measurement can be read directly from a measuring instrument.
Precision refers to how close measurements of the same item are to each other. Precision is independent of accuracy.
Therefore the correct option is A.

It was only in 1921, with the discovery of insulin, the field of endocrinology became popular. Thomas Addison is considered as ‘The Father of Endocrinology’.

Humulin R is a brand name for regular insulin. It is a short-acting insulin. That means that it takes about 30 minutes to reach your bloodstream and works for about three to six hours.
Humalog is a brand name for insulin lispro, which is a fast-acting insulin

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