Which group of mammals exhibits the widest
distribution and greatest diversity?
a. marsupials
b. monotremes
c. placentals
d. marsupials and monotremes
e. placentals and monotremes
Answer: c
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Lichens take up nutrients and pollutants from airborne dust, so many cannot survive where the level of air pollution is high. The U.S. Forest Service monitors lichens on tree trunks as part of its program to assess the health of forest communities. Lichen is a(n) ____
a. pioneer species b. indicator species c. primary succession species d. keystone species e. exotic species
A blood vessel is indicated by the letter ____
a. A b. B c. C d. D e. E
Which of the following describes the offspring of asexually produced spores?
a. They have a different mating type from the parent fungus. b. They are clones of the parent fungus. c. They are unable to reproduce. d. They have no mating type.
Which of the following options correctly lists the order of the four main processes that occur in the urinary system?
A) filtration, excretion, reabsorption, secretion B) excretion, filtration, reabsorption, secretion C) filtration, reabsorption and secretion occurring simultaneously, excretion D) reabsorption and secretion occurring simultaneously, excretion, filtration