Environmental Science
Biogas is composed of

carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and sulphur
ethane, carbon dioxide, nitrogen and hydrogen

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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
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
All of these

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Environmental Science
Ecology is

The science that studies the evolution of life,
Integrates both social and natural sciences to help us understand how the earth works,
The study of the environment in the absence of humans
The study of the relationships between organisms and their environment

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