A student is investigating the question “Which increases a person’s breathing rate more after three minutes, lifting five-pound weights or lifting ten-pound weights?” She designs an experiment to test the question. Which is the dependent variable in her experiment?
Scientists recently identified the function of three proteins in plants. The proteins regulate the production of fatty acids, which are found in fats and oils. Which question will most likely be asked about the results, leading to more investigations?
Sometimes new information results in minor changes to a theory. But sometimes new information results in a theory being discarded as incorrect. An example of an incorrect theory that was disproved by the discovery of new information is
For a research article, Carlos is studying the latest treatments for antibiotic-resistant diseases, which are caused by pathogens that are resistant to most antibiotics. So far, his primary source is a textbook that was updated five years ago. Carlos should
Which best explains why a scientific idea would lack scientific consensus?
A scientist publishes a paper that states that changes in the levels of gases in the atmosphere of a moon of Saturn indicate that there may be extraterrestrial life on that moon. Which statement correctly answers whether the question of alien life on this moon is scientific?
Dani wants to measure the volume of a pebble. Which tool will give the most accurate measurement?
How can a liquid be drawn into a pipette safely?
A researcher is collecting qualitative data pertaining to social behaviors of deer at different times of the day. How will she most likely need to organize this data?
A scientist asked a question that was based on an observation. What should the scientist do next?
Sarah performs an experiment to see whether bees prefer red flowers or yellow flowers. Look at this table of results from the experiment. Number of bees found on yellow flowersNumber of bees found on red flowersDay 11214Day 21020Day 31418Day 41215What is the independent variable in this investigation?
Which description indicates that a question is nonscientific?
Edward Jenner’s smallpox inoculation experiment was based on his observation that dairymaids who had had cowpox did not contract smallpox. How did Jenner form his hypothesis from this observation?
As one story goes, the famous 20-century physicist Niels Bohr and his team were interviewing a young man for a job. As part of the interview, the man described a hypothesis he had developed. A few days later, the man returned to find out whether he had been hired. Bohr greeted him with these words: "We are all agreed that your hypothesis is crazy. What divides us is whether it is crazy enough to be correct." The man was hired. What example of scientific thinking does Bohr's response best indicate?
In what way do investigations build scientific knowledge?
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