refers to the agricultural practices in which the members of a farming family produce only enough food for their family's own subsistence and do not make use of large-scale irrigation, chemical fertilizer, or machinery and technology.

Subsistence agriculture.

Explanation: Subsistence agriculture is a type of farming in which farmers cultivate and grow food crops and livestocks to meet their needs and that of their family.

In this type of agriculture, farm products is aimed to survival and it doesn't involve use of large-scale irrigation, chemical fertilizer, or machinery and technology.

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the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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