Which line from the text shows why scientists continue to study yawning?

one thing is certain: you are probably fighting the urge to yawn right about now.
other scientists believe, however, that yawning is a form of communication.
one mystery that still remains unsolved is why we yawn—what makes us yawn and what purpose it serves.
the theory is that yawning cool the brain, allowing it to work more efficiently.

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.

Which statement best describes a typical difference that could be found between the "analysis" and "conclusion" sections of a lab report? a) only the "conclusion" describes errors that occurred during the experiment, and only the "analysis" section suggests further research.b) only the "analysis" section includes specific data comparisons, and only the "conclusion" section suggests further research.c) only the "analysis" section discusses whether the original hypothesis was supported, and both sections include graphs of data.d) only the "conclusion section discusses whether the original hypothesis was supported, and both sections suggest further research.(the answer is b i just took the test)

Aprocedure done under controlled conditions to test a hypothesis is an inquiry.