Part A-Experimental design: Controlling variables Damschen and her team were able to conductamanipulative experiment to test their hypothesis Connecting patches plant species richness in the patches. They cleared 30 large patches of 1orest at the Savannah River Site 50that the patches a started with a plant species richness of zero. Then they set up different treatments to simulate connectedness and lack of connectedness. They used strips of cleared land, called corridors, to connect patches. To control for the many variables present in a field experiment, it was critical that the experiment was designed properly. If the patches differed in more than the presence or absence of a corridor, it would not be properly controlled, and they could not be certain if results were caused by the corrido or some other variabl To test the hypothesis that comidors promote plant species richness, they created two types of patches, shown below. One patch, caled the connected patch, was connected to a central patch by a 150 m comidor A second patch, called the unconnected winged patch, was 150 m from the central patch but not connected by a comidor. Wing 150 m 000 m Comidor 150 m Connected Central Unconnected patch "winged" patch patch 25 m Adapted from Damschen, E et al. 2006. Comid Plant species Richn at Large scales. Science 313, 12B4-1286. This design enabled them to control for several factors. 1. The total area ofthe patch plus the comidor, or the patch plus the wings was the same. 2. The total amount of edge (perimeter of each patch) was similar betweenthe two treatments. 3 Both patch types were the same distance from the central patch. Below are 4 examples of ways Damschen and her colleagues could have designed their experiment. Identify what is wrong with each design.

Need asap which of these is an example of a hypothesis? (2 points) a. adults were not interviewed b. the investigation was time consuming c. the source of information was biased d. very few teenagers were interviewed scientists in different parts of the world have conducted experiments to find the speed of light in vacuum. if the results of the experiments are identical, they would most likely be (2 points) a.valid b. biased c. unreliable d. non-observable which of these questions can be answered using science? (2 points) a. what is the best career? b. does water exist on venus? c. should the use of automobiles be stopped? d. which is the most interesting subject to study? the models can be best used to (2 points) recreate something which is easily observed in nature prove that all atomic theories have the same meaning demonstrate the transformation of atomic theory into law represent the locations of subatomic particles in different atomic theories 22. (bws.06) scientists earlier believed that the lowest measurable temperature is the freezing point of ice. however, modern scientists believe that temperatures below the freezing point of ice can also exist. what best accounts for these different opinions? (2 points) scientists propose contradictory ideas to include all possibilities scientists come up with different hypotheses without enough evidence scientists propose different ideas to avoid repetition of scientific knowledge scientists having different interests may interpret the same data in different ways based on the graph, what is the most likely mass of an apple chosen randomly from the basket? (2 points) between 0.10 kg and 0.12 kg between 0.12 kg and 0.14 kg between 0.14 kg and 0.16 kg between 0.16 kg and 0.18 kg a scientist studies a model of a widely accepted theory about the position of planets and sun. the model would most likely the scientist to (2 points) prove that the theory would not change in the future demonstrate how the theory can be changed into a law understand facts which cannot be easily observed prove that all other facts about the universe are incorrect one scientist discovered a new theory on the evolution of the universe. what is the next step for the scientist to take? (2 points) transform the results of the theory into universal laws of nature inform the scientific community so they can verify the results call a press conference to make the discovery popular among people encourage scientists worldwide to find an appropriate application for the results the students' observations are listed below. when an iron nail is taken near the north pole (n) of the bar magnet, it is pulled towards the magnet. when an iron nail is taken near the south pole (s) of the bar magnet, it is pulled towards the magnet. the experiment was repeated by several students using different bar magnets. based on the investigations, which of these theories would the students most likely propose? (2 points) magnets attract iron nails the poles of a magnet attract all materials iron nails are attracted towards all materials iron nails have the same properties as magnets