As different as frogs are from you and I, you can clearly see how
similar vertebrates are to each other when you dissect one. One heart,
two lungs, a stomach, liver, spleen, gall bladder, intestines, kidneys,
bladder, and gonads are visible in this particular dissection, as well
as the extraordinarily strong leg muscles.
Brehms Tierleben, Bd. 1. Alfred Brehms, 1911.
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