Jack's crossword

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Across
  1. 3. a triangular tool used to lift or hold something in place
  2. 4. are machines that transmit motion via teeth that mesh together
  3. 5. animals, plants, fungi, protist, monera
  4. 6. animals that eat meat instead of insects and plants
  5. 7. a warm blooded animal that doesn't birth eggs
Down
  1. 1. a simple machine made out of rope and a wheel that changes the direction of the force
  2. 2. the advantage of load divided by effort
  3. 8. something that is alive