Of the four major Earth systems, which one is composed of living organisms?

A) atmosphere
B) hydrosphere
C) lithosphere
D) biosphere


Answer: D

Environmental & Atmospheric Sciences

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Some of the world's hypercities and megacities are merging into vast urban ____.

A. marked regions B. megaregions C. mini-cities D. neighborhoods E. ultracities

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The Long-Term Ecological Research sites (LTER) collectively focus on studying

A) natural successional changes in ecosystems. B) the effects of various types of human disturbances to ecosystem function. C) how to make invasive species profitable for agriculture. D) the creation of artificial soils for ecosystems lacking producers.

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An important geochronometer is the decay of 147Sm to 143Nd. What type of radioactive decay is involved in this parent-daughter pair?

A) alpha decay B) beta decay C) a positron capture D) electron capture

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Resource exchange webs designed for industries to reduce waste are modeled after food webs in nature.

Answer the following statement true (T) or false (F)

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