The Panamanian golden frog is in decline because of __________, which are being driven by ____________.
A. outbreaks of a virus, global climate change
B. outbreaks of a fungus, deforestation
C. introduced species, increased global trade
D. outbreaks of a fungus, global climate change
E. outbreaks of a virus, deforestation
D. outbreaks of a fungus, global climate change
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In optimizing foraging, birds often stop feeding in an area and move on, even though there are still some seeds left. What is the best explanation for this observation?
A. Other areas may have food at a lower density. B. They will leave some seeds to create the next generation of plants. C. The density of the food becomes low, so it will take too much energy to find. D. They are more likely to find a mate if they move around. E. They are safer from predators when moving.
Respond to statements 95–99 with reference to the five trophic
categories listed below. a. producer b. herbivore c. primary carnivore d. secondary carnivore e. decomposer M 95. A primary consumer is this. M 96. A Venus flytrap devouring an insect to obtain nitrogen functions as this. M 97. Most mushrooms function as this. M 98. A bear feeding on a salmon is functioning as this. E 99. A bear eating blueberries is functioning as this.
____ food chains tend to predominate in aquatic ecosystems.
A. Higher trophic level B. Primary consumer C. Decomposing D. Grazing E. Detrital
In order to visualize the fine structure of viruses and cytoskeletal filaments at 10-25 nanometers in diameter the type of microscopy that would be most effective is
A. transmission electron microscopy. B. standard light microscopy. C. differential-interference microscopy. D. phase-contrast light microscopy. E. darkfield light microscopy.