How are amphibians different from reptiles? a) They do not breathe using lungs.
b) They cannot be fully terrestrial.
c) They do not have a backbone.
d) They are not ectothermie.

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those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive