Conservation biologists are often concerned that when the population size of an endangered species becomes too small it is at risk of extinction for which reason?
A. They can no longer evolve.
B. Their rate of breeding will decline.
C. They may be more susceptible to changes in the environment or disease.
D. They are at risk of sympatric isolation.
E. They are at risk of developing prezygotic barriers to reproduction.
C. They may be more susceptible to changes in the environment or disease.
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The west coast of Africa and South America in the tropics do not support corals. Which of the following would likely prevent coral growth in these areas?
a. cool northern flowing currents b. cool upwelling water c. depth of 25 meters d. both a and b
Dinoflagellates
a. may produce red tides that poison and kill fish. b. produce a poison that builds up in the tissues of shellfish and may kill humans who eat infected shellfish. c. may undergo a population explosion that turns the ocean red or various colors. d. commonly are photosynthetic marine plankton. e. are all of these.
Worms all appear to be closely related but have distinct evolutionary histories, resulting in the classification of worms into ________ phyla
A) one B) two C) three D) four
In living organisms, the molecule most associated with temperature stability is _____.
A) molecular oxygen B) sugar C) hemoglobin D) sodium chloride E) water