Which term describes species that play crucial roles in helping to keep their ecosystems functioning?

A. cornerstone
B. foundational
C. keystone
D. critical
E. primary


Answer: C

Environmental & Atmospheric Sciences

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The doubling time of a population is inversely proportional to its total fertility rate

Indicate whether this statement is true or false.

Environmental & Atmospheric Sciences

Small glassy, translucent particles found in sediments and thought to be of extraterrestrial origin are called ________

a. turbidites b. tektites c. authigenic d. oozes

Environmental & Atmospheric Sciences

Imagine you fly a direct route from northern Greenland to the southern part of Hudson Bay. The correct sequence of climate types you would pass would be

A. E, ET, Dfc. B. ET, E, Dfc. C. Dfc, E, ET. D. Dfc, ET, E.

Environmental & Atmospheric Sciences

Which of the following best describes a mass wasting event referred to as a fall? 

A. material moving down-slope along a surface B. material tumbling through air or down a steep slope C. material moving as a viscous fluid D. mixture of rock and snow

Environmental & Atmospheric Sciences