In an estuary, the zone of maximum vertical difference in density of water layers is called the
A) thermocline.
B) pycnocline.
C) mixing zone.
D) hypolimnion.
B
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____ behavior corresponds to an animal's "nature"; learned behavior corresponds to its " ____ ."
Fill in the blank with the appropriate word.
Which of the following is a chronic inflammatory pulmonary disorder characterized by reversible obstruction of the airways?
A) tuberculosis B) chronic obstructive pulmonary disease (COPD) C) asthma D) pulmonary edema E) pulmonary fibrosis
Climate change occurs because greenhouse gases absorb _______ radiation
a. UVA b. UVB c. visible d. infrared e. cosmic
All of the following are true about bryophytes EXCEPT
A. they are now the most abundant plant group on land. B. they can be found from the Antarctic to the tropics. C. they erode rocks to produce soil. D. they produce peat that can be used as fuel.