A food web is a more realistic depiction than a food chain because:a
organisms rarely eat just one kind of food.
b. energy flow is linear.
c. energy flow is cyclic.
d. a more complex model is always better than a simple one.
e. matter cycles in ecosystems.
A
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A species that is naturally found only in a particular location is called
A. extinct. B. endemic. C. extinct due to the action of humans. D. exotic. E. transitional.
Four of the five eggs listed below possess large
amounts of yolk. Select the exception. a. sea urchin egg b. snake egg c. bird egg d. turtle egg e. fish egg
The gametophyte generation of ferns is called the:a
prothallus. b. protonema. c. gemma. d. thallus. e. fiddlehead.
All vertebrates except ____ have a two-circuit circulatory system.
A. fish B. mammals C. birds D. amphibians E. reptiles