If three samples have the half-lives listed below, which is the most radioactive?
A. a sample with a half-life of 20 years
B. a sample with a half-life of 20 minutes
C. a sample with a half-life of 20 million years
D. a sample with a half-life of 20 hours
E. none of the above
Answer: B
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Discuss the development of early vertebrates into advanced fish and, finally, into amphibians. What body changes
were required to accomplish this move from the marine environment to land? What will be an ideal response?
Variations in Earth's axial tilt from 21.5° to 24.5° is known as
A) eccentricity. B) obliquity. C) precession. D) inclination.
Judge the following sentence according to the criteria given below: Coastal waters and upwelling areas are almost always yellow-green in color BECAUSE they contain large amounts of microscopic marine algae and suspended particles
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
Geologists believe that ____________________ are the remains of reef structures from one of the first
photosynthesizing organisms. Fill in the blank(s) with the appropriate word(s).