Hormones can belong to which of the following classes of chemical messengers?
A) adrenergic
B) peptidergic
C) steroid
D) all of these
D
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How has the Smokey the Bear campaign, which attempted to eliminate wildfires from forested areas altogether, damaged forest health? What is the importance of fire in ecosystem management? What is the cost of fire suppression for ecosystem health?
What is the alternative to fire suppression?
Which of the following radioisotopes is used in PET scans?
A) C-14 B) F-18 C) H-3 D) P-32
One piece of evidence that suggests the existence of Pangaea is continuous mountain ranges spanning Australia and Antarctica.
Indicate whether the statement is true or false.
On this map of earthquakes near Japan, why do shallow earthquakes (yellow dots) occur to the east and deeper earthquakes (red dots) occur to the west?
A) The continental crust is thicker to the east.
B) The crust is hotter near Japan, closer to the volcanoes.
C) There is a continental collision to the east.
D) The subduction zone dips to the west.