Which of the following ecosystems accounts for 21.0% of the world marine fishery?
A) Coastal and coral systems
B) Nontropical shelves
C) Open ocean
D) Tropical shelves
E) Upwellings
D
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Because the same shore may be made of different rock types, shorelines ________; because waves refract, the shoreline ________
a. become irregular; straighten b. straighten; become irregular c. become irregular; become irregular d. straighten; straighten
What type of geologic feature is formed at the intersection of two converging continental plates?
a. Spreading centers
b. Mountains c. Subduction zones d. Rifts e. Volcanoes
Chymotrypsin has 251 stereocenters. What is the maximum number of stereoisomers possible for a molecule with this number of stereocenters?
A) 251 B) 2 x 251 C) 2251 D) 10251
Describe the theory of plate tectonics
What will be an ideal response?