Within the nitrogen cycle, which organism both coverts and releases nitrogen?
a. bacteria
b. viruses
c. fungi
d. plants
e. humans
ANSWER: a
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True or False: Learning is often based on imitation, including human learning
A. true B. false
The seeds of many plant species are dispersed by a harmless temporary attachment to an animal's fur or feathers. This form of dispersal is known as
A. ectoparasitism. B. amensalism. C. mutualism. D. phoresy. E. trophic mutualism.
The osmoregulatory and ionoregulatory problems facing a saltwater fish are
A. loss of water and loss of ions. B. loss of water and gain of ions. C. gain of water and loss of ions. D. gain of water and gain of ions. E. buildup of urea in tissues.
The songs of sparrows are _____
a. all genetically identical b. adaptively dissimilar c. characteristic of it species and its species alone. d. characteristic of all mating songs e. all related to predator avoidance