The keystone species in a Pacific Northwest
Old Growth Forest
a. is the Spotted owl, that preys on rodents.
b. are the mice that feed on mushrooms and
truffles.
c. are the Douglas fir trees that are dominant
species.
d. are the Douglas squirrels that spread the
seeds of the Douglas fir.
e. are the piliated woodpeckers that nest in
Douglas fir
A
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Homo erectus and the modern humans differ in
A. social behavior. B. living as tribes. C. their brain size. D. their upright posture. E. opposable thumbs.
Anaerobic organisms thrive:
a. in oxygen-free environments. b. where oxygen is abundant. c. where carbon dioxide is abundant. d. in surface waters of the ocean. e. in the middle of the water column.
____ are short sections of underground stem encased by overlapping layers of thickened, modified leaves called
scales. a. Stolons b. Rhizomes c. Bulbs d. Corms e. Tubers
Archaeons power their flagella by proton motive force (PMF), whereas bacteria empower their flagella by ATP hydrolysis.
Answer the following statement true (T) or false (F)