Hard plastic bottles commonly used by hikers often contain the chemical
A) BPA, which is a hormone mimic and may pose a health hazard.
B) phenolphthalein, which has been clearly shown not to have significant health effects.
C) PERC, which may result in minor skin rashes and other allergic reactions.
D) PCBs, which may interfere with thyroid gland function.
A
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Walker-like cells are found between:
A) A and B
B) B and C
C) C and D
D) B and D
Which of the layers in the diagram below are rigid?
A) 1 and 2
B) 2 and 3
C) 1, 2, and 3
D) All of them are correct.
Four of the five listed outcomes are problems in National Parks. Choose the one that is the exception.
A. introduction of nonnative species B. killing of native species C. polluted air D. agricultural runoff E. deferred repairs of infrastructure
Which statement best describes how region 5 will look in the future?
A. close to sea level because it will be underlain by a combination of oceanic crust and thin continental crust B. below sea level as this area becomes part of an accretionary prism C. higher in elevation because magma generated along a subduction zone will rise into and thicken the crust