Phylum Chordata. Phylum Chordata. Includes 5 Classes Fish Amphibians Reptiles Birds Mammals. Fish. Habitat : nearly every aquatic environment Respiration : use gills to breathe Circulation : 2 chambered heart Reproduction : sexual (mostly external)
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Includes 5 Classes
(water needed to transport sperm and
eggs must be kept moist)
Must haves to be a mammal:
Mammals are classified into 3 groups based on their method of reproduction