Suppose Priestley repeated his experiment using many kinds of plants besides mint, and that when different plants were placed under the jar the candle remained lighted for different periods of time. What would be a logical conclusion from these experiments?
a) Different plants require different amounts of water.
b) Different plants release different amounts of carbon dioxide.
c) Different plants require different amounts of light.
d) Different plants release different amounts of oxygen.
Answer: d) Different plants release different amounts of oxygen.
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The functional units of the kidneys are the
A. neurons. B. glomerulus. C. nephrons. D. collecting ducts. E. ureters.
Birds have scaly feet and lay amniotic eggs. This supports the idea that:
a. reptiles evolved from amphibians. b. birds are the only creatures to ever have feathers. c. birds are endothermic. d. birds evolved from reptiles. e. None of the above.
Organisms suffering from malnutrition may have a diet deficient in
A) one or more essential nutrients. B) bile and acids needed for digestion. C) digestive enzymes. D) water.
You conduct a study to determine how the amount of time spent studying affects students' performance on exams, and you want display the data you have collected using a line graph. What is the dependent variable, and on which axis should it be represented in your graph?
A) The dependent variable is "time spent studying," and it should be represented on the x-axis. B) The dependent variable is "time spent studying," and it should be represented on the y-axis. C) The dependent variable is "performance on exams," and it should be represented on the x-axis. D) The dependent variable is "performance on exams," and it should be represented on the y-axis. E) The dependent variable is "time spent studying," and it can be represented on either the x- or y-axis