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#Question id: 12755

Which of the following statements best describes why biologists are currently concerned with global warming and the thawing of permafrost in many areas of the tundra biome?

#10. Ecological Principles
  1. The thawing process will likely decrease the abundance and diversity of soil-dwelling organisms in tundra habitats.
  2. The bacterial decomposition of  the thawed organic materials on  the widespread areas of  the tundra will produce large quantities of CO2, which will add to greenhouse gases and exacerbate global warming.
  3. Oil and coal deposits will thaw and rise to the surface (because of their lower density) of the tundra, destroying millions of acres of arctic habitat.
  4. Populations of humans inhabiting the arctic will have to move to more southern latitudes, resulting in in- creased competition for resources in already densely populated areas.
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TLS Online TPP Program

#Question id: 6954

#5. Developmental Biology

Between fertilization and the first cleavage division, actin filaments pull the cytoplasm of the frog egg toward the point of sperm entry in a process called:
TLS Online TPP Program

#Question id: 6957

#5. Developmental Biology

The effect of grafting an extra piece of notochord into a dorsal position adjacent to pre-somitic mesoderm is
TLS Online TPP Program

#Question id: 6959

#5. Developmental Biology

Which of the following is NOT involved in left-right asymmetry of vertebrates?
TLS Online TPP Program

#Question id: 6961

#5. Developmental Biology

Do HOX genes play a role in the development of C. elegans?
TLS Online TPP Program

#Question id: 6962

#5. Developmental Biology

In which way is the organizer region of the sea urchin similar to that in frogs?
TLS Online TPP Program

#Question id: 6963

#5. Developmental Biology

During early sea urchin development, which embryonic cells have similar organizer activity to that of amphibian Spemann organizer?