Environmental Science
"A good absorber of a given wavelength of radiation is also a good emitter of that wavelength." This is a statement of:

Stefan-Boltzmann's law
Kirchoff's Law
The Law of Relativity
Wien's Law
The First Law of Thermodynamics

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Environmental Science
What is meant by ex-situ conservation?

Conservation of a species by protecting its habitat along with all other species living there
Conservation of plants
Conservation of a species outside its natural habitat
Conservation of forest eco system

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