Environmental Science
Most of the radiation emitted by a human body is in the form of:

Infrared radiation and is invisible
Visible radiation but is too weak to be visible
Ultraviolet radiation and is invisible
Humans do not emit electromagnetic radiation

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Environmental Science
During the winter solstice in the Northern Hemisphere:

Astronomical winter begins in the Northern Hemisphere
The noon sun is overhead at 23.5o S latitude
All of these
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year

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