Which isotope of oxygen is most likely to be a positron emitter?
A) 15O
B) 16O
C) 17O
D) 19O
A
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What percentage of Earth's water is in the oceans?
A)50 percent B)55 percent C)93 percent D)97 percent E)99 percent
Susan is conducting an experiment to see if plants will grow better with application of fertilizer. She separates 50 plants into two groups of 25. One group receives a liquid fertilizer when watered every other day, and the other group receives only water on the same days. The plants are kept in a greenhouse with constant and equal amounts of sunlight, and a constant temperature. She measures the plants once a week for 12 weeks. At the end of 12 weeks, the plants with the fertilizer grew an average of 9 inches, and the ones that were not given the fertilizer grew an average of 5 inches.When referencing the above scenario, why did Susan average the resulting heights of the plants?
A. To account for differences in temperature and sunlight between the groups. B. She liked showing off her knowledge of simple statistical analysis. C. To account for the genetic variation in the plants. D. Because two numbers are easier to compare than 50.
Of the three sciences, physics, chemistry, and biology, the most complex is
A. biology, because it is based upon both the laws of chemistry and physics. B. physics, because it involves many mathematical equations. C. chemistry, because there are so many possible combinations of atoms. D. All three of these sciences are equally complex.
Indonesia is a former colony of which European country?
A. Great Britain B. France C. the Netherlands D. Belgium