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4. Man's best friend
6. energy energy released during a nuclear reaction because of fission or fusion
10. electricity produced by means of water power
12. advantage the ration of the working force exerted by a mechanism to the applied effort
14. energy the definition of biomass is a renewable energy source from living or recently living plant and animal materials which can be used as fuel. An example of biomass is plant material that produces electricity with steam. An example of biomass is animal fossil fuel.
16. a rigid bar pivoted about a fulcrum, used to transfer a force to a load and usually to provide a mechanical advantage
17. physical or mental effort directed towards doing or making something

1. energy energy obtained from air flow using wind turbines or sails to produce mechanical or electrical energy
2. the study of the mechanical properties of air and other gases
3. Large marsupial
5. energy energy derived from the heat in the interior of the earth
7. Likes to chase mice
8. Flying mammal
9. energy energy obtained by harnessing waves
11. Has a trunk
13. strength or energy as an attribute of physical action or movement gear a toothed machine part that meshes with another toothed part to transmit motion or to change speed or direction
15. energy energy obtained from solar power