Вопрос № 237682 - Английский язык

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Compound is a substance in which the atoms of two or more elements are joined together by chemical bonds. Because of these bonds, it is very difficult to split a compound into its individual elements. The type and number of bonds formed depend on the electrons (particles with a negative electrical charge) in each atom. The properties of a compound can be very different from those of the elements it contains. For example, the salt we use in our food is a harmless compound, yet it is made up of two dangerous elements – sodium, which reacts violently with air, and chlorine, which is poisonous in large quantities.

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The _____ must be accessible to maintain the service elements located above it.

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In ecology a niche is a term describing the relational position of a species or population in an ______.

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The chemically unstable oxygen-rich _____ characterizes our planet.

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The first principle of ecology is that each living organism has relationship with every other element that makes up its _____.

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The _____ tends to evolve to a state of ideal balance.