The loss of a(n) ____ species can lead to population crashes and extinctions of other species in a community that depends on them for certain ecosystem services.
A. foundation
B. indicator
C. native
D. keystone
E. specialist
Answer: D
Environmental & Atmospheric Sciences
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The _____________ separates China and Mongolia.
Fill in the blank(s) with the appropriate word(s).
Environmental & Atmospheric Sciences
How far must one travel to get away from Earth's gravitational field?
A) to a region above Earth's atmosphere B) to a region well beyond the Moon C) to a region beyond the solar system D) Forget it; you can't travel far enough.
Environmental & Atmospheric Sciences
Boundaries that separate individual strata from one another are called ________________. Fill in the blank(s) with the appropriate word(s)
Environmental & Atmospheric Sciences
About what percentage of the workforce of North America is currently employed in the primary or secondary sectors of the economy?
A) 5% B) 20% C) 40% D) 50%
Environmental & Atmospheric Sciences