The growth of plants and formation of land mammals characterized the paleozoic era.
        
                    
             
        
        
        
 Answer:
Muscles contract rapidly to produce heat on a cold day.
Explanation:
 
        
             
        
        
        
The radius of the circle would be 7.42in
        
                    
             
        
        
        
 Biodiversity is intimately linked to the production of ecosystem services. ... Invest models habitat quality<span> and rarity as proxies for biodiversity, ultimately estimating the extent of </span>habitat<span> and vegetation types across a landscape, and their state of degradation.</span>