Approximately 3.85 billion years ago, a group of single-celled microorganisms known as ________ were alive, reproducing, and evolving.

A. fungi
B. bacteria
C. archea
D. flora


Answer: C

Environmental & Atmospheric Sciences

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Which model of convection describes how the interior is divided into several levels of convection cells?

A) Layer cake model B) Whole-mantle convection C) Plume model D) Differentiation model

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Resource Partitioning

What will be an ideal response?

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A localized zone of melting (commonly thought to be stationary) below the lithosphere is called a(n) ____

a. orogeny b. hot spot c. lava flow d. chert e. graywacke

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The upper layer of an aquatic ecosystem where sunlight penetrates is termed the euphotic zone.

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

Environmental & Atmospheric Sciences