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2. Learn how gene therapy seeks to repair genetic mutations through the introduction of healthy genes
3. An examination of the molecule adenosine triphosphate (atp), the primary carrier of energy in cells
4. The role of bacteria in breaking down organic matter in a forest
5. Learn about English scientist John Dalton's atomic theory from the early 19th century
6. Learn what the atmosphere is made of
7. Overview of different types of grasslands and their locations, climate, and animal life
8. Learn about otters and their habits
9. A history of women's suffrage around the world
10. Explanation of the principle of the conservation of energy
11. Learn how mushrooms reproduce using gills that hold thousands of reproductive cells called spores
12. Overview of recycling as a way to reuse waste materials
13. Use of a Punnett square to illustrate how Gregor Mendel determined the way traits are inherited
14. Explore the structural hierarchy of organization in living things, from cells to entire organisms
15. Learn how animals survive the winter months in a variety of ways, including hibernation
16. Learn how an energy pyramid shows how energy flows from one level to the next in an ecosystem
17. Learn why some animals stockpile food for the winter, while others hibernate
18. The process of mitosis (cell division) beginning with cell growth and then division
19. Learn how the Louisiana Purchase doubled the size of the United States
20. Discover how plants have evolved into many diverse forms that define and sustain ecosystems
21. Timeline of women's voting rights
22. Learn about the dynamic relationship between wolf and moose populations of Michigan's Isle Royale
23. Overview of the Seven Wonders of the ancient world
24. Learn about the important characteristics that distinguish fungi from plants and animals
25. Overview of fractions
26. A survey of Mexico City's history as Tenochtitlan, the center of Aztec civilization
27. Overview of rock art images most commonly made on cave walls by ancient peoples throughout the world
28. Overview of the nitrogen and phosphorus cycles in the biosphere
29. Learn about the important consequences that deforestation has on the global carbon cycle
30. Scientists find evidence for climate change in rock art, fossils, tree growth rings, and ice sheets
31. Explore the many factors that control climate, including latitude, ocean currents, and wind
32. An overview of the process of organic decomposition used in waste management
33. Explore the causes of wind and how it is formed
34. Plant classifications. Learn about tracheophytes, a large group of vascular plants that includes ferns
35. Understanding how energy flows through an ecosystem
36. Discover the reproductive cells of chromosomes called haploid and diploid cells
37. Overview of the seven wonders of the ancient world
38. The mystery of how Amelia Earhart disappeared while attempting to fly her plane around the world
39. Learn how the printing press, invented by Johannes Gutenberg, ushered in a new era literacy
40. Learn what life was like for travelers on the Oregon Trail
41. Overview of early Texas history and its movement toward independence
42. Learn how Robert Fulton invented a boat that harnessed the steam engine and revolutionized travel
43. Explore the regions where two tectonic plates meet, in which volcanoes tend to be located
44. Understand the process of cell division called mitosis
45. Overview of the Mexican-American war
46. Learn about astronaut Sally Ride, who became the first American woman in space in 1983
47. Learn about the seven natural wonders of the world
48. Overview of the Abolitionist movement in the United States, including The Underground Railroad
49. Learn how the continents broke apart from the Pangea landmass and moved to their present positions
50. Learn about Garrett Morgan, who invented the traffic signal to help make car travel safer
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