_____ Encourages Users of a Product or Service to Ask

question 21

Short Answer

_____ encourages users of a product or service to ask their friends to use the product or service as well.

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Definitions:

Earth's Chemical Cycles

Natural processes that recycle chemicals such as carbon, nitrogen, and oxygen between the Earth's atmosphere, hydrosphere, lithosphere, and biosphere.

Usable Forms

Refers to resources or materials that have been converted into a state where they are ready for use by organisms or human technologies.

Nitrogen

A chemical element with the symbol N and atomic number 7, making up about 78% of the Earth's atmosphere and essential for living organisms.

Nitrite Ions

An anion with the chemical formula NO2-, derived from nitrous acid, commonly found in soil and water where it participates in the nitrogen cycle.