The cordilleran flycatcher and pacific-slope flycatcher were once thought to be the same species, but they are now known to be different species because they have different common names they don't look the same they have different diets they do not interbreed

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b. the carbon cycle ensures living things have a source of hydrogen

there's no big difference.

explanation:

the only little different between a rabbit and bunny is just that bunnies are much smaller than rabbits. bunnies are basically baby rabbits.