Which one of the following statements best reflects the overall position of current science on the role of biodiversity in ecosystems?
A) The more species in an ecosystem, the greater the biomass production.
B) The more species in an ecosystem, the greater its drought resistance.
C) The effects of biodiversity loss on ecosystem function depend on how many and which species are lost.
D) Every species in an ecosystem is equally essential to maintain the overall ecosystem.
C
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Dr. James Hansen of NASA has stated that we should set a goal of keeping CO2 levels below 350 ppm. Which year did we first exceed that level? If we decreased CO2 levels at the same rate that we have increased them over the past 10 years, how long would it take until CO2 levels were again below 350 ppm?
What will be an ideal response?
Lighter elements (atomic number less than 5) were created by:
a) Accretion during nebula formation b) Nuclear fusion during or right after the Big Bang c) Nuclear fusion within earliest stars d) Nuclear fusion during supernova e) Nuclear fission within stars
Even without the possibility of a nuclear accident, no primary energy source seems to generate more controversy and debate in the United States than nuclear power
Discuss three important environmental impacts that are a result of the normal operation of a nuclear power plant.
All harmful algal blooms are caused by dinoflagellates.
Answer the following statement true (T) or false (F)