Environmental Science
What is edge species?

Rare species
Species on the verge of extinction
The species which occur abundantly in the ecotone
Endemic species

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Environmental Science
The wind-chill factor:

Indicates the temperature at which water freezes on exposed skin
Relates body heat loss with wind to an equivalent temperature with no wind
Tells farmers when to protect crops from a freeze
Determines how low the air temperature will be on any given day
Takes into account humidity and air temperature in expressing the current air temperature

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