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A fish swims into an estuary from a river, what is the greatest physiological challenge? [a]A) The high water flow would make the fish expend more energy.B) The low oxygen content would give the fish difficulty in swimming aerobically.C) The temperature change would stress the fish by denaturing its proteins.D) The change in salt content would challenge the osmotic balance of the fish.

What interactions exist between a lion and wildebeest? [a]A) +/+B) +/-C) 0/0D) -/-

What limits the number of trophic levels in most ecosystems? [a]A) Many primary and higher-order consumers are opportunistic feeders.B) Decomposers compete with higher-order consumers for nutrients and energy.C) Nutrient cycling rates tend to be limited by decomposition.D) Energy transfer between trophic levels is less and less efficient.

Two divisions of a company decide to use the same manufacturing facilities to capitalize on the organization’s excess capacity and to reduce the fixed costs assigned by corporate headquarters. This is an example of

Which of the following best describes the behavior of a single male mating with multiple females? [a]A) promiscuity B) polygynyC) polyandryD) monogamy

Managers maintain and transmit culture through all but one of the following. Which one?

Matter, like energy, cannot be created or destroyed, but what does happens to it? [a]A) Chemoautotrophic organisms convert it to energy.B) It can move from one ecosystem to another.C) Detritivores convert solar energy to food matter.D) Heterotrophs convert heat to energy.

Penicillin works best on what type of prokaryote   [a]A) gram negative bacteriaB) archaeaC) endospore producing bacteriaD) gram positive bacteriaE) mycoplasma bacterial species

Cows are herbivores, thus they are [a]A) primary producersB) primary consumersC) secondary consumersD) secondary producers  

Which of the following has the greatest effect on the rate of chemical cycling in an ecosystem? [a]A) the rate of decomposition in the ecosystemB) the production efficiency of the ecosystem’s consumersC) the trophic efficiency of the ecosystemD) the location of the nutrient reservoirs in the ecosystem