by 
Marievic
ANSWERS: 1
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Frogs are vertebrates and so have an endoskeleton which consists of the following features: a broad skull with large orbits for the two eyes a short spine with from five to nine pre-sacral vertebrae usually no ribs a single sacral vertebra (seen as the 'hump' in sitting frogs the urostyle (a peculiar rodlike bone formed from fused tail vertebrae, long leg, feet and toes bones, two elongated ankle bones that enable the legs to fold for jumping. The body form of the frog is adapted as a lever system that can catapult the animal into the air. And therein lies your answer.
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