Environmental Science
The most important reason for decrease in biodiversity is

Habitat pollution
Habitat destruction
Over-exploitation
Introduction of exotic species

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Environmental Science
How do red and blue light differ?

Red light has a higher intensity.
Red and blue light have different directions of polarization.
Blue light has a higher speed of propagation.
The wavelength of red light is longer.

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Environmental Science
During the winter solstice in the Northern Hemisphere:

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

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