Environmental Science
A graphic representation of number of individuals of different species belonging to each trophic level in a an ecosystem is known as

Ecological pyramid
Pyramid of energy
Pyramid of number
Pyramid of biomass

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Environmental Science
The wind-chill factor:

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

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