Answer the question using the accompanying figure. According to the graph, which biomes are defined by a mean
annual precipitation under 50 cm?
a. tropical forest, desert, and savanna
b. temperate deciduous forest, savanna, and tropical forest
c. boreal forest, temperate deciduous forest, and tundra
d. desert, tundra, and chaparral
e. desert, tundra, and grassland
ANSWER: d
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Microbial antagonism is the
A. prevention of immune responses by the resident microbiota. B. inhibition of T cell binding to microbes. C. suppression of the complement cascade by microbes. D. competition for nutrients, oxygen, and space between the resident microbiota and potential pathogens.
In the central nervous system, _________ wrap axons with layers of plasma membrane. oligodendrocytes The resting potential of
Fill in the blank(s) with the appropriate word(s).
What structure do lobsters use for gas exchange?
A) gills B) lungs C) skin D) tracheae
Which highly reactive gas was probably absent from the Earth's primitive atmosphere?
A) methane B) carbon dioxide C) oxygen D) water vapor