According to the scientific method, a legitimate hypothesis
A) must be testable
B) need not be testable
C) must be understandable by the layperson
D) can never be proven to be incorrect
Answer: A
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The mass extinction at the end of the Ordovician set the stage for:a
more species to go extinct. b. groups of organisms to diversify. c. groups of organisms to withdraw from previous habitats. d. groups of organisms to repopulate abandoned niches. e. groups of organisms to diversify AND to repopulate abandoned niches.
A normal fault is:
a. when the movement is entirely horizontal. b. when the hangingwall moves up over the footwall. c. when the footwall moves up relative to the hangingwall.
Which of the following rocks cannot be metamorphosed?
A. sandstone B. shale C. limestone D. All of these can be metamorphosed.
Fish populations in one area of Borneo have dropped by 70% due to
a. mining for lithium using mercury b. mining for plutonium c. strip mining d. arsenic pollution secondary to gold mining e. extracting gold from stream sediments using mercury