Amphibians probably evolved from the __________, an important group of lobe-finned fish. Fill in the blank(s) with the appropriate word(s)
crossopterygians
Environmental & Atmospheric Sciences
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Which of the following nuclear equations correctly describes alpha emission?
A. 
U ? 
He
B.
 U ?  Pu | +  He |
C.
U ? 
Th + 
HeD.
U ? 
U + 
HeE. none of the above
Environmental & Atmospheric Sciences
Rapid amounts of photosynthesis can create variations in the alkalinity of seawater. Indicate whether the statement is true or false
Environmental & Atmospheric Sciences
What is the greatest known cause of global amphibian declines?
A) pollution B) fires C) displacement by invasive species D) parasites and disease E) habitat loss
Environmental & Atmospheric Sciences
Paleoclimate studies require that scientists find paleoclimate ________, materials that have retained a unique signature of the ancient climate conditions.
A. models B. air bubbles C. proxies D. records
Environmental & Atmospheric Sciences