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...f life, even including some vertebrates - for example, a species of shark (hammerhead) has been recently found able to self-fertilize and produce progeny in the

...f a third-class lever, a hammer will not work without a weighted head. The hammerhead is, in fact, an energy storage device. Kinetic energy is stored in the head

*Hammerhead sharks (Sphyrnidae, 9 species)