Many of the world's major medicines are indirectly derived from:
A. Biodiversity.
B. Eutrophication.
C. Labor-intensive agriculture.
D. Natural selection.
Answer: A
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Which of the following statements regarding a nucleon is true in regards to nuclear reactions?
A) A nucleon inside a nucleus has a lower mass than a nucleon outside of the nucleus. B) The number of nucleons changes in a nuclear reaction, therefore the mass changes. C) A nucleon has a higher energy inside a nucleus, and releases it when it undergoes nuclear reactions. D) A nucleon's mass is constant. E) A nucleon is more stable outside the nucleus.
A pulley system raises a 1000-N load with 100 N of input force. The efficiency of the system is
A) 10 percent. B) 90 percent. C) 100 percent. D) 1000 percent. E) not enough information given
The effect of forces on a mass's acceleration is described by ________
Fill in the blank(s) with the appropriate word(s).
All the organisms and their physical and chemical environment within a specific area best describe ________
A) ecosystems B) biomes C) ecological communities D) populations E) the biosphere