Why is only one variable tested at a time during a scientific investigation?

Which statement describes quantitative observations?

If Megan is asked to determine the density of a small irregular object, which two scientific tools would she use to determine its density?

Many scientists accept the theory that excess carbon dioxide emissions from cars and industry form a layer of gas in the upper atmosphere that traps heat. The result is an increase in the average temperature on Earth. Which observation supports this

A scientist observed a skin cell and a muscle cell under an electron microscope. He noted that the muscle cell has more mitochondria than the skin cell. What can be concluded from this?

A student performs several tests on two cells and concludes that one of the cells is a plant cell and the other is an animal cell. What observation did the student make to justify that conclusion?

Diabetes is a disease resulting in high blood sugar due to insufficient insulin production. Many drugs are available to treat diabetes. Which statement is a logical explanation for why so many drugs are available to treat one disease?

When should scientists revise their conclusions?

Why was the Royal Society of London's skepticism of van Leeuwenhoek's discovery of microscopic life in 1676 important in the scientific process?

What led scientists to revise their theories about the science of genetics in the late 1940s and 1950s?

A researcher discovers new evidence that does not support his original conclusion of a five-year scientific investigation. What should the researcher do next?

Why is a vaccine not the perfect solution for common viral illnesses such as the flu or the cold?

Are wind turbines the perfect solution to the world's renewable energy issues?

Computer modeling has improved the way meteorologists predict the weather. Is this technology the perfect solution for improving weather forecasting?

What action should be taken to get an accurate scientific measurement of the mass of an object?

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