Which trophic level usually contains more energy than any other trophic level in an ecosystem?
a. producers
b. primary consumers
c. secondary consumers
d. tertiary consumers
e. This answer has not been determined for most ecosystems.
A; As energy flows from one trophic level to the next some of the energy is lost. Therefore autotrophs (producers) usually contain more energy than other levels. An exception may be phytoplankton populations because they turn over very quickly.
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Over the past several decades, the overall trend for earth's temperatures has been
A. decreases in overall global temperatures at an accelerating rate, a phenomenon known as global cooling. B. a gentle trend towards colder winters and hotter summers, which averages out to be very little overall global temperature changes. C. cyclical periods of warming and cooling, known as global climate change. D. increases in overall global temperatures at an accelerating rate, a phenomenon known as global warming.
What would a scientist see when looking through a microscope at a piece of shoulder muscle?
A. striations with branched fibers B. no striations and unbranched fibers C. no striations and branched fibers D. striations with unbranched fibers E. None of the answers are correct.
Some hemicellulose will contain ____,which consists of a backbone of รข-1, 4-glucose molecules to which side chains
of five-carbon sugar are attached. a. cellulose b. xyloglucan c. lignin d. ?-galacturonic acid e. pectin
In healthy adults, a loss of more than ____% of total body fluid is required to alter homeostasis and cause illness.
A) 10 B) 15 C) 20 D) 30