A fish swims into an estuary from a river, what is the great…
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.
Read DetailsWhat limits the number of trophic levels in most ecosystems?…
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.
Read DetailsMatter, like energy, cannot be created or destroyed, but wha…
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.
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