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Across 3. the ______ _______ is the continual movement of Earth's water among Earth's atmosphere, oceans and land through evaporation, condensation and precipitation (Fact 117) 9. Darwin developed the theory of _______ by natural selection (Fact 185) 11. the main organ of the excretory system in the human body is the _______; the function of this system is the eliminate wastes from the bloodstream and the body (Fact 197) 13. _____ ______ in the human body are groups of organs that work together (Fact 193) 14. The color of a star depends on its composition; hot stars are blue, cold stars are _____ (Fact 74) 18. ____ ______ is the idea that organisms that are better adapted to their environment are more likely to survive and reproduce than other members of the same species (Fact 186 21. the main organ of the respiratory system in the human body is the _______; this system functions in the exchange of gases necessary in breathing (Fact 195) 23. Earth has only one moon; the changing appearances of Earth's moon are known as _____ (Fact 41) 24. ____ ______ are planets that do not have solid surfaces; all of the outer planets (Jupiter, Saturn, Uranus and Neptune) would be categorized as these (Fact 57) as 26. the ______ _______ consists of about 100 trillion cells (Fact 190)

Down 1. The _____ _____ is a widely accepted explanation of the relationship between cells and living things; the three parts of it are, all living things are made of cells, cells are the basic unit of structure and function and all cells are produced from other cells (Fact 156) 2. the ________ system in the human body consists of the brain, the spinal cord, sensory organs and nerves; the function of this system is control of the body and communication among its parts (Fact 198) 4. the _______ system in the human body includes the mouth, salivary glands, esophagus, stomach, intestines, pancreas and the liver; the function of this system is to break down food and provide energy for the body (Fact 196) 5. Tissues are groups of specialized _________ that perform the same function (Fact 191) 6. it takes the _______ about one year (a little over 365 days) to revolve one time around the sun. (Fact 52) 7. The solar system formed about 4.6 billion years ago form a huge cloud of dust and gas called the _____ ______ (Fact 26) 8. in 1835, _____ ______ traveled to the Galapagos Islands to study the organisms that lived there (Fact 184) 10. the __________ is made of all living things on Earth (Fact 116) 12. _____ are structures composed of different types of tissue that do specific jobs in the body (Fact 192) 15. _________ is the study of earthquakes (Fact 130) 16. the ________ system in the human body consists of the heart and the blood vessels; the function of this system is to circulate blood and transfer nutrients (Fact 194) 17. The 4 phases of mitosis are prophase, _______, anaphase and telophase (Fact 173) 19. an _________ is a trait that helps an organism survive (Fact 187) 20. _________ means an organism no longer survives (Fact 188) 22. _______ are factors that control traits (Fact 176) 25. It takes the _______ about 29.5 days (a month) to revolve around the Earth (Fact 45)