Which class of organisms makes up the detrital food web?
a. carnivores and decomposers
b. decomposers and detritivores
c. decomposers and producers
d. herbivores and carnivores
e. producers and herbivores
ANSWER: b
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If O2 and N2 are present in equal amounts in an environment, both will have an equal chance of serving as an electron acceptor during respiration (that is, organisms do not have a preference as to which molecule is reduced)
A. true B. false
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A cladogram is based on:
a. homologous characteristics. b. homoplastic characteristics. c. polyphyletic taxa. d. fossil evidence only. e. derived characters only.
Although the most frequent forms of Down syndrome are caused by a random error, nondisjunction of chromosome 21, Down syndrome occasionally runs in families. The cause of this form of familial Down syndrome is ________
A) an inversion involving chromosome 21 B) too many X chromosomes C) a chromosomal aberration involving chromosome 1 D) a translocation between chromosome 21 and a member of the D chromosome group E) a maternal age effect