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Type Chordates: external features and internal structure

The melting point metals

Litmus test - a universal indicator to determine the degree of acidity and alkalinity

Distances in space.

A black hole and a journey through time

How many countries in the world - no precise information

What is a nautical mile and knot what is?

Qualitative reaction to glycerin - specific, which helps to detect

Chemical equilibrium - based on reversible chemical reactions

Space speed

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The meaning of "OKS" - "be careful"
The semantics - the science, without which incredibly difficult to learn the language
Promising whether science, language learners?