Why do experiments usually test only one variable at a time?

Which of the following is an example of qualitative data?

$$\textbf{\ \ a.}\text{ The temperature decreased from 20}{^\circ C}{\ to \ 15}{^\circ C.}$$

$$\textbf{\ \ b.}\text{ The fish swam in a zig-zag motion across the pond.}$$

$$\textbf{\ \ c.}\text{ The plant's height is 25 centimeters.}$$

$$\textbf{\ \ d.}\text{ The six pairs of robins hatched an average of three chicks per nest.}$$

Based on the results of the snake mimicry case study, suggest another hypothesis researchers might investigate further.

Suppose you observe your neighbor's dog barking at various times of the day and night.

What other observations would help you hypothesize why the dog barks when it does?

Explain the differences between science and technology.

Describe the benefits scientists gain by sharing information with one another?

What is the purpose of a scientific model?

List characteristics that make a hypothesis scientific.

Why is a controlled experiment a useful tool in hypothesis-based science?

Which of the following is the best definition of science?

$$\textbf{\ \ a.}\text{ a body of knowledge gathered through experiments}$$

$$\textbf{\ \ b.}\text{ a process of accidental discovery}$$

$$\textbf{\ \ c.}\text{ a search for answers to questions about the natural world}$$

$$\textbf{\ \ d.}\text{ a method of asking testable questions based on hypotheses}$$

How is a theory different from a hypothesis?

How does scientific inquiry differ from simply asking questions?

Write a hypothesis to explain why a door hinge squeaks. Then use your hypothesis to make a prediction that could be tested.

How did Native Americans' religious beliefs affect their lives in North America?