Rhythmic leaf folding is an example of
a. positive feedback.
b. division of labor.
c. circadian rhythms.
d. homeostasis.
e. negative feedback.
Answer: c
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The return of carbon dioxide to the atmosphere and nitrogen to the soil is due to the action of
A. viruses and plants. B. bacteria and viruses. C. fungi and bacteria. D. fungi and viruses.
Which vessel of the human body can serve as a
blood reservoir?
a. vein b. venule c. capillary d. arteriole e. artery
Retroviruses are unique because they are a combination of RNA and DNA.
Answer the following statement true (T) or false (F)
A positive feedback loop is one that tends to amplify a process. Why would the effect of deforestation on the water cycle be considered a positive feedback loop?
A. Because deforestation leads to reduced nutrient uptake during the growing season, which results in more fertile soil. B. Because deforestation leads to new types of habitat which leads to greater species diversity. C. Because deforestation leads to an increase in the concentration of nutrients in run off, which then leads to eutrophication. D. Because deforestation leads to a decrease in precipitation, which results in further loss of vegetation.