Two birds species regularly visit feeders for sunflower seeds during the winter. For a month, several students take turns watching the feeding station from 6:30 to 7:30 every morning and recording t... heir observations. They find that whenever individuals of one species arrive at the feeder, the individuals of the other species leave. The students conclude that competition for food between the species is an important factor in their ecological relationship. The students' conclusion above would be most strengthened by adding which of the following elements to their study? - ✔✔Observing the feeding behaviors of both species under natural conditions. A scientist at a respected university announces in a press conference the discovery of a new compound that can kill several types of cancer cells with minimal harm to healthy cells. Many cancer researchers are unimpressed by the announcement. Which of the following actions taken by the scientist would convince the larger community of cancer researchers to take his claim seriously? - ✔✔Publishing the data and methodology from the work so it can be replicated Which of the following units is most appropriate for reporting a species' population density? - ✔✔Organisms per square meter A student would like to design a basket for a bicycle to carry various school-related items. The student looks up several commercial designs on the internet and decides to make a less expensive basket using materials from a hardware store and from around the home. The next step in the design process would be to: - ✔✔Figure out how much weight the basket needs to carry, what size is practical, and whether it should be in front or in back. Feedback control - ✔✔Describes a system in which the product of a process controls or is itself an input of the system. Rosalind Franklin and Maurice Wilkins's analysis of the DNA molecule with X-ray crystallography contributed to which of the following breakthroughs in DNA research? - [Show More]
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