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.

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

A chemical produced by animals that serves as a communication to animals of the same species [a]A) pheromoneB) a neural markerC) a chemical inducerD) the location of the nutrient reservoirs in the ecosystem

 In the classification of joints, which of the following is true?

Which of the following do scientists believe migrating birds use? [a]________.I) the stars in the night skyII) the sun during the dayIII) the magnetic field of the EarthA) only IB) only IIC) only IIID) I, II, and III