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Reticular formation.

What is the indifference curve?

Steam engine - the invention of the past with a promising future

What makes the glass?

The structure of the egg: general information

Journalistic style speech

Diethyl ether - Use in medicine

Annelids: a brief description of the type

Analyzers person: the general scheme of the building and a brief description of functions

X-rays

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Blue ara in natural and home.
How many continents in the world?
Galium verum: useful properties and use in folk medicine