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Across 2. the ___________ of a wave is the number of complete waves that pass a given point in a certain amount of time (Fact 205) 6. ____________ is a physical property and can be used to identify a substance and is mass per unit volume (Fact 225 8. ________ is a chemical property and describes when two or more substances interact with each other and a chemical reaction has taken place (Fact 228) 11. __________ ________ is divided into two main branches of chemistry and physics (Fact 217) 14. ___________ __________ is the temperature at which a liquid changes to a gas (Fact 224) 15. ___________ are organisms that use sunlight to make their own food through a process called photosynthesis (Fact 147) 19. the 3rd stage of the cell cycle is __________; during this stage the cytoplasm divides and organelles are divided into two daughter cells (Fact 172) 21. physical properties are identified with the five senses or by making ______________ (Fact 223) 22. electromagnetic ________ is energy carried by waves (Fact 208) 23. the __________ of a wave is the distance a wave travels per unit time (Fact 207)

Down 1. the _______________ system consists of skeletal, smooth, and cardiac muscles; its' main functions are related to movement of the body, maintenance of posture, and circulation of blood (Fact 199) 3. __________ are organisms that eat producers or other organisms for energy (Fact 149) 4. ________ is the study of matter, energy, motion, and forces (Fact 219) 5. ________ ______ is the temperature at which a liquid changes to a solid (Fact 224) 7. ____________ or the ability to burn is a chemical property (Fact 227) 9. _____________ are organisms that that break down the remains of dead organisms for energy (Fact 150) 10. ________ _______ is a physical property and is the temperature at which a solid changes to a liquid (Fact 224) 12. the second stage of the cell cycle is _________; during this stage the nucleus divides and one copy of the DNA is distributed into each of the daughter cells (Fact 172) 13. the _________ system consists of the heart and the blood vessels; its function is to circulate blood and transfer nutrients (Fact 194) 16. ___________ properties can be observed without changing the identity of the matter (Fact 223) 17. the first stage of the cell cycle is _________; during this stage the cell grows, makes a copy of its DNA and prepares to divide into two cells (Fact 170) 18. __________ properties of matter describe a substance based on its ability to change into new substances with different properties (Fact 226) 19. ____________ is the study of the properties and interactions of matter (Fact 218) 20. chemical properties are identified by _______ (Fact 226)