By Lynn Van Gorp
Antoine Lavoisier has been known as the founding father of sleek chemistry. The French scientist is so much remembered for constructing the medical technique, that is a cautious, step by step technique for proving or disproving anything.
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Roundworms, like the one shown in Figure 15, are common in puppies. This roundworm attaches itself to the inside of the puppy’s intestine and feeds on nutrients in the puppy’s blood. The puppy may have abdominal pain, bloating, and diarrhea. If the infection is severe, the puppy might die. A symbiotic relationship in which one organism benefits but the other is harmed is called parasitism (PER uh suh tih zum). , (c)Marian Bacon/Animals Animals, (b)Sinclair Stammers/Science Photo Library/Photo Researchers 433-S3-MSS05-LBE 8/19/04 10:52 PM Page 23 Niches One habitat might contain hundreds or even thousands of species.
Use a different colored pencil for each population’s line on the graph. Conclude and Apply 1. Explain whether or not the results support your hypothesis. 2. Compare the growth of your control and experimental populations. Did either population reach exponential growth? How do you know? Compare the results of your experiment with those of other students in your class. For more help, refer to the Science Skill Handbook. LAB E ◆ 27 Runk/Schoenberger from Grant Heilman 433-CR-MSS05-LBE 8/19/04 10:47 PM Page 28 SCIENCEAND HISTORY SCIENCE CAN CHANGE THE COURSE OF HISTORY!
Air becomes warmer when sunlight heats the air molecules. Because there are fewer air molecules at higher elevations, air temperatures there tend to be cooler. At higher elevations, trees are shorter and the ground is rocky, as shown in Figure 6. Above the timberline—the elevation beyond which trees do not grow—plant life is limited to low-growing plants. The tops of some mountains are so cold that no plants can survive. Some mountain peaks are covered with snow year-round. TEMPERATURE CHANGES You climb a mountain and record the temperature every 1,000 m of elevation.