The most recent major advance of glacial ice in North America is called the ____

a. Wurmian
b. Nebraskan
c. Holocenean
d. Wisconsinan
e. Greenlandan


d

Environmental & Atmospheric Sciences

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The nutrient-poor open ocean tends to support a(n) ________ biological pump compared to coastal and upwelling regions.

A. ballasted B. efficient C. complex D. inefficient

Environmental & Atmospheric Sciences

The energy that powers the biosphere comes almost entirely from ________

A) soil nutrients. B) abiotic chemical reactions. C) endogenic processes. D) fluvial action. E) the Sun.

Environmental & Atmospheric Sciences

Mutation and ________ are the key mechanisms that generate and maintain genetic variation among individuals in most populations

A) natural selection B) adaptations C) asexual reproduction D) inbreeding E) sexual reproduction

Environmental & Atmospheric Sciences

At what clock time does the Sun actually reach zenith on:

October 13? March 8? May 20? Today?

Environmental & Atmospheric Sciences