Presently, the replacement fertility rate in developed countries is ____
a. 2.0
b. 2.1
c. 2.4
d. 2.6
e. 2.8
ANSWER: b
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Which one of the following enabled plants to spread across the land?
A. the increase in atmospheric oxygen B. the co-evolution of fungi C. the presence of bulk transport systems D. the evolution of new photosynthetic pathways
what is the last step in the physiology of the endotoxic shock?
What will be an ideal response?
The first step in the development of living organisms was the formation of
A) DNA. B) organic molecules from gases in the atmosphere. C) enzymes. D) inorganic molecules from elements in the ocean waters. E) simple sugars.
In the 1990s, researchers attempted to improve the balance of amino acids in soybean protein by inserting a gene from Brazil nuts. Which of the following is the best reason as to why the transgenic soybeans have never been grown commercially?
A) The public was misinformed by food-safety advocates and refused to buy products made from the modified soybeans. B) The modified soybeans could not grow with the foreign gene present. C) Regulatory hurdles made the modified soybeans too expensive to market profitably. D) Some people were allergic to the protein product of the Brazil nut gene.