Two students are planning an experiment that will test how planaria (aquatic flatworms) respond to different environments. They
will conduct two investigations—one that tests the worms’ responses to different water temperatures and one that tests the worms’ responses to different levels of acidity. Student 1 wants to buy two groups of flatworms and use a different group for each investigation. Student 2 thinks the same group of worms should be used for both investigations. Do you think either student’s method would give more accurate results? Why or why not? Explain your response.
The Student 1's method would bring more accurate results.
Explanation:
Student 1 wishes to use 3 healthy worm groups. The first group goes to environments with different water temperatures and the second group goes to an environment with different levels of acidity. As both groups had the same level of health it is possible to compare well the difference of influence of each environment on these worms. In addition, the third group was not placed in any different environment, so it remains healthy, so when compared to groups 1 and 2, it will be possible to know the different influences that the environment provided to healthy worms.
On the other hand, Student 2's method would use a single group for all environments and this would not show reliable results because the worm would accumulate effects from all the environments in which it entered.
Student 1’s methods would be more accurate, because the student would control more factors. Only one variable at a time (either temperature or acidity) would be tested on each group of worms. On the other hand, Student 2 is testing both factors on all the worms, which could make the results unclear.
F Enzyme Action and Changes<span> in pH. G The Effect of Temperature on Enzyme Populations. H How Enzyme Action Alters Temperature. J. The Effect of Temperature on Enzyme Action. 11 </span>Two parent butterflies<span> with </span>normal wings have offspring<span> with </span>altered wing shapes<span>. What </span>most likely caused<span> this</span>change<span>? A speciation.
If thousands of glucose molecules were bonded together with equal numbers of sucrose molecules, the resulting substance could be described as a polysaccharide. They are <span>polymeric carbohydrate molecules composed of long chains of monosaccharide units bound together by glycosidic linkages.</span>
In the case shown above, the existence of musculoskeletal disorders should be evaluated initially so that the most appropriate treatment to repair any of these disorders and prevent more serious problems such as changes in posture, body movement and the natural movement of people should be started quickly. joints of the patient's body, which can cause physical deficiencies and severe deformations.
When the predators' population is increased, there will be a high risk to the cricket frog from these predators as they may start attacking them rigorously and ultimately lead to a sharp decline in their population.
