The company claims that the mineral supplement can effectively prevent the common cold. A scientist disputes the claim, investigation.
Which change to the investigation would remove the source of this error?
OA Test a fourth group, in which participants do not receive the mineral supplement.
B. Test all three groups, with each participant receiving the mineral supplement for 12 months.
C. Test only one group, with each participant receiving 200 mg/day of the mineral supplement.
D. Test only two groups, one with each participant receiving 200 mg/day and one with 50 mg/day of the mineral suppler
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The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

In order to calculate the amount of heat transferred you must know the __ and specific heat of the material, as well as the change in temperature. a. volume b. density c. mass d. enthalpy

Which of the following best supports the concept that genetic information is passed on to offspring from both of their parents, not just one?