have fur, feed their young milk, born alive, warm blooded, breathe air​ (a)  

have scaly, watery skin : live in & around water: cold blooded: lay eggs (a)  

have moist skin and begin their life in the water: respiration is through their skin: lay eggs (a)  

live underwater and have fins: live in fresh and saltwater: breathe through gills: cold-blooded​ (a)  

body temperature varies with surrounding temperature​ (a)  

regulate their body temperature​ (a)  

​ (a)   have a backbone: mammals, birds, fish, reptiles, and amphibians

do not have a backbone: insects, spiders, and worms​ (a)  

Organize these options into the right categories