A small number of scientists disagree that global climate change is caused by human activity. However, scientific consensus supports the idea that human activity is affecting climate. This is possible because
In what way do investigations build scientific knowledge?
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
In the 1700s, Isaac Newton determined that the force of gravity between two objects depends on the mass of the objects and distance between them. He reasoned that things fall toward Earth because it has so much mass. Then in the 1900s, Albert Einstein worked with new discoveries, such as the fact that light always travels the same speed, and he determined a new explanation of how and why gravity works. Mass and distance still matter in Einstein’s explanation, but speed also matters. Newton’s explanation still works for objects close to Earth, but Einstein’s explanation works for all of the objects in the universe.
The scientist Konstantin Mereschkowsky knew in the early 1900s that plants make their own food by using sunlight. He also saw tiny parts in plants called chloroplasts that do not appear in any animals. He hypothesized that chloroplasts are what help plants make food. After many more observations of all types of plants and animals, scientists are convinced today that chloroplasts make food for plants.
Dr. Katherine Pollard, a biostatistical researcher, recently changed the method that she used to compare human and chimpanzee DNA. Her research showed that the differences between the two species’ DNA are in segments called switches, which turn certain genes on or off. What is the most likely outcome of Dr. Pollard’s research?
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?
Tara sees a commercial for a brand of pills that promise to boost energy and help people perform better in work and school. As people in the commercial talk about how much better they feel when taking the pill, Tara notices a message on the bottom of the screen that reads, "This pill is not approved by doctors and has not been tested in controlled experiments.”
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?
Read the observation, question, and hypothesis.Observation: Hotter water seems to produce more bubbles than cold water when it is mixed with dish soap.Question: Does water temperature affect the amount of bubbles that are produced from dish soap?Hypothesis: Hot water produces more bubbles than cold water when it is mixed with dish soap.D’Angela will mix soap and water in a clean beaker four times. To test her hypothesis, which conditions should change or remain the same each time?
Line graphs that indicate time along the x-axis can be used to predict what would happen to dependent variables in an experiment at a later point in time
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?
After observing a moth that is camouflaged against dark-colored bark, a scientist asks a question. The scientist discovers that the question has already been asked and answered by several investigations. What should the scientist do?
In a scientific investigation of lakes, the depth of a lake is most likely to be measured in
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