Which body system is mainly affected by Creutzfeldt-Jakob disease?
A. genitourinary system
B. nervous system
C. respiratory system
D. circulatory system
E. digestive system
Answer: B
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Which of the following would be considered an example of bioremediation?
A) adding nitrogen-fixing microorganisms to a degraded ecosystem to increase nitrogen availability B) using a bulldozer to regrade a strip mine C) dredging a river bottom to remove contaminated sediments D) reconfiguring the channel of a river E) adding seeds of a chromium-accumulating plant to soil contaminated by chromium
In land plants what % of the water transported by the xylem is used for metabolism?
a. 66% b. 85% c. 2% d. 32% e. 90%
How does the evidence for the theory of common descent demonstrate consilience?
A) scientific evidence is refuted by other scientists B) new evidence can be added to the theory of common descent C) observations driven from different sources agree on the findings. D) new evidence cannot be added to the theory of common descent
Make up 65% of bone by mass. Consist mainly of tiny calcium phosphate crystals in and around collagen fibers. Responsible for hardness and resistance to compression.
What will be an ideal response?