Of the following weather factors, which is most important in determining the plant and animal populations that can exist in an area? air pressure cloud cover humidity temperature

Temperature is usually the most important of these weather factors in determining what plant and animal species can exist in an area. Temperature determines what kinds of species can live in an area because the climate determines what types of plants can grow and also what kinds of animals can live in an area. Certain species of animals have particular temperature ranges in which they live and thrive in. 

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The fact that the earth goes through natural cycles for example the ice age some scientists belive that it is just another cycle