... canines, which are used to kill and rip pieces of prey, in addition to jagged premolars and molars, which shred and grind food. Herbivores, plant eaters, have as expected, a less destructive dental set, consisting mainly of teeth with broad, ridged surfaces, to grind food, as well as modified ... which further increase surface area and absorption. This is because vegetation takes longer and is harder to digest than meat because of the presence of cell walls. For example, a koala has to chew excessively to make sure the plants go down in small pieces. The koala also has a ... of air (nece...

• Word Count: 821
• Approx Pages: 3
• Grade Level: Undergraduate

... if cork were made of tiny cells, other living things might be made of cells, too. By using their microscopes, they found that every living plant and animal they examined was made of cells. As microscopes were improved, scientists were able to see smaller and smaller organisms. They found that no ... matter how large or small the organism was, it was made of cells. This led to the cell theory. According to this theory, all living things are made of cells, and all life activities of each organism take place in these cells. Today ... , very powerful microscopes are used to learn even more a...

• Word Count: 1272
• Approx Pages: 5
• Grade Level: High School

... is an addictive poison. Dr. David Reuben, author of Everything You Always Wanted to Know about Nutrition says, "White refined sugar is not a food. It is a pure chemical extracted from plant sources, purer in fact than cocaine, which it resembles in many ways. Its true name is sucrose and its chemical formula is C12H22O11. It has 12 carbon atoms, 22 hydrogen ... the excess carbohydrates, which results in abnormal sugars containing four carbon atoms in the bloodstream that accumulate in the brain, red blood cells and nervous system, ultimately, interfering with the cell respiration (Dufty...

• Word Count: 2214
• Approx Pages: 9
• Has Bibliography
• Grade Level: Undergraduate