Which of the following strategies can make aquaculture more sustainable?
A. restoring native aquatic habitats and harvesting in moderation
B. farming one species of fish at a time
C. using antibiotics to control diseases
D. feeding fish grain because it is so abundant
E. using wild fish as a food source for farmed fish
Ans: A. restoring native aquatic habitats and harvesting in moderation
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In the fall of 2012, Hurricane Sandy caused more than 110 deaths and an estimated $65.5 billion of damage along the Atlantic coast of the United States. Who needs to be involved in preparing for the next "Sandy"?
A. politicians, who we elect to take care of us B. engineers, who design our buildings and transportation systems C. scientists, who are responsible for innovation and new ideas D. Every individual is responsible for his or her future. E. We are all, together, collectively responsible for preparing for our future.
For some virulent phages, fragments of the host DNA may be included in the heads as the viral particles assemble, thus providing the basis for transduction of bacterial genes during the next cycle of infection. What is the name of this mechanism?
a. generalized transduction b. transformation c. transmutation d. specific transduction
Which of the following has the greatest amount of kinetic energy?
A) The cool air surrounding the car engine B) A moving car C) A tank of gasoline D) A hot car engine E) An unlit firecracker
In order for a variable to be a valid instrumental variable it needs to satisfy which two conditions?
A. Efficient and uncorrelated B. Relevant and efficient C. Relevant and exogenous D. Exogenous and consistent