What happens to ecosystems when a keystone species is lost?
What will be an ideal response?
The overall ecosystem health is decreased.
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The process used to demonstrate that two rock strata are equivalent is called
a. equivalency. d. correlation. b. interpolation. e. none of the above. c. extrapolation.
An example of a ________ or nodal region is the Chicago metropolitan region, which shares a variety of economic, political, and other functions
Fill in the blank(s) with correct word
What radioactive material is the main fuel used to produce nuclear energy?
A) Uranium-238 B) Uranium-235 C) Lead-207 D) Thorium-232
Who made the first clear statement of the law of superposition? When?
A) John Wesley Powell, nineteenth century B) Nicolaus Steno, seventeenth century C) William Smith, eighteenth century D) John Stuart Priestly, nineteenth century