What is the main difference between amphibians and arthropods?

I do think that the main difference between amphibians and arthropods is that amphibians are vertebrates while arthropods are invertebrates

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

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