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TLS Online TPP Program

#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?

#Unit 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: 11957

#Unit 7. System Physiology – Animal

Because the foods eaten by animals are often composed largely of macromolecules, animals need to have mechanisms for ________.
TLS Online TPP Program

#Question id: 11958

#Unit 7. System Physiology – Animal

Fat digestion yields fatty acids and glycerol, whereas protein digestion yields amino acids; both digestive processes ________.
TLS Online TPP Program

#Question id: 11959

#Unit 7. System Physiology – Animal

The process by which digested dietary substances cross cell membranes to be used by the body is known as ________.
TLS Online TPP Program

#Question id: 11960

#Unit 7. System Physiology – Animal

Mechanical digestion, the process of breaking down large chunks of food into smaller pieces, is important because smaller pieces of food ________.
TLS Online TPP Program

#Question id: 11961

#Unit 7. System Physiology – Animal

The large surface area in the gut directly facilitates ________.
TLS Online TPP Program

#Question id: 11962

#Unit 7. System Physiology – Animal

 In the digestive system, peristalsis is ________.