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On Land: 
1.) Capability of breathing oxygen without the use of gills. 
2.) Powerful limbs are able to allow the animal to escape quickly. 
3.) Can feed on many land-dwelling animals. 

In Water: 
1.) Capability of breathing oxygen via skin pores. 
2.) Webbed feet allow for propulsion. 
3.) Ambush predation.
1 4 1

pulmocutaneous respiration and double circulation
1 5 1
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