Based on all possible combinations V, J, D and constant regions, approximately how many antibody combinations are theoretically possible?
A) approximately 10,000
B) approximately 1,000,000
C) more than 2 million
D) more than 1 billion
C
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Which of the following is an example of a persistent pollutant?
A. Bacteria in treated sewage sludge that is spread on fields. B. DDT which is found in soil years after its use but is eventually destroyed by soil bacteria. C. Organophosphate insecticides that kill insects for several days but do not bioaccumulate in food chains. D. Carbon monoxide that breaks down after reacting with oxygen. E. None of these is an example of a persistent pollutant.
Why are fisheries heavily impacted by ENSO events?
a. Upwelling ceases b. Nutrient-rich currents are interrupted when the trade winds shift c. Low pressure systems create downwelling events rather than the normal upwelling d. Rise in sea level effects migration patterns
In some cases, areas where oil spills were cleaned had communities in worse shape than in areas where
an oil spill was left alone. Indicate whether the statement is true or false.
The water mass moving through a seismic sea wave can reach speeds of 760 kilometers per hour
Indicate whether the statement is true or false