Scientific Method Question of the Day Question: Why does the scientific method matter? Answer: … … … Inv. 3.3: Beans & pH Killer Oranges: Words to Know • Hypothesis- a scientific explanation for a set of observations that can be tested in ways that support or reject it. #44 • Variable- a factor that can be changed in an experiment or affect the outcome #39 • Control- a group that is exposed to the same conditions except for the one variable being studied • Conclusion- when the data of the experiment are examined to either support or reject the hypothesis #37 A.Q. 1a, 2a, 3 on p. 78 • 1a. Question: Energy is said to flow in a “oneway stream” through an ecosystem. In your own words, describe what that means. • 1a. Energy is said to flow in a “one-way stream” through an ecosystem means that energy is not recycled. Energy enters through a food chain, but it is not reused—it is lost as heat. A.Q. 1a, 2a, 3 on p. 78 • 2a. Question: On average, what proportion of the energy in an ecosystem is transferred from one trophic level to the next? Where does the rest of the energy go? • 2a. On average, about 10% of the energy at any trophic level is passed to the next trophic level. The remainder of the energy is used for life processes or released into the environment as heat. A.Q. 1a, 2a, 3 on p. 78 • 3. Question: Refer to Figure 3-9, which shows a food web in the Everglades. Choose one of the food chains within the web. Then, write a paragraph describing the feeding relationships among the organisms in the food chain. • 3. Plants are eaten by deer, which are eaten by bobcats, which are scavenged by vultures when they die.