Which two of these four structures are of the same structural isomer?
A. lower right and upper right
B. lower left and upper right
C. upper right and lower left
D. upper left and lower right
Answer: C
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Mutualism is ________
A) a relationship in which two species have a mutual predator B) a relationship with no benefits to either species C) a relationship between two species in which both benefit D) a relationship between a beneficial predator and its prey E) a relationship between two species in which only one benefits
The permanently frozen subsoil of the subarctic regions is termed _______________
Fill in the blank(s) with correct word
Which of the following generates most ocean waves?
A) Large objects falling into the ocean B) Passing ships at the surface C) The movement of different air masses D) Tidal movement and turbidity currents E) Wind blowing across the surface
A keystone species is an organism that ________.
A. lives in coastal regions B. is very abundant C. plays a crucial role in an ecosystem D. is endangered