All the energy available to humans has its origins in

The sun

Explanation:

This is because humans are heterotrophs, meaning they source their energy from the other organism by feeding on them. The food chains begin with primary producers that convert the energy from the sun into biomass through the process of photosynthesis. This energy rises up the food chain as the primary producers are fed on by consumers (humans included).

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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