The background extinction rate is estimated to be about ___ per million species years (E/MSY).
a) 1500
b) 500
c) 3.5
d) 1
e) 26
Ans: d) 1
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Multiple Excitatory Postsynaptic Potentials (EPSPs) from temporal summation and spatial summation can result in:
A. an action potential. B. filtering out of unimportant background signals. C. adaptation. D. hyperpolarization.
The depth distribution of algae is limited by:
a. temperature. b. pressure. c. pH. d. light quality. e. salinity.
Thick filaments are parallel bundles of ____ molecules
a. actin b. tropomyosin c. acetylcholine d. myosin e. troponin
Which statement is correct, according to the figure above?
a. Descendant populations of the mustard plant growing after the severe 2000–2004 drought flowered much earlier in the season than those from predrought populations. b. Descendant populations of the mustard plant growing after the severe 2000–2004 drought flowered much later in the season than those from predrought populations. c. Hybrids flowered much later in the season than those from predrought populations. d. None of the above. e. B and C.