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 second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.