Card 31 / 112: Modern day scientists hypothesize one element was missing in the atmosphere of early earth. What was this element?
A) Nitrogen
B) Oxygen
C) Ammonia
D) Methane

Answer:
B) Oxygen

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Evolutionary Biology & Ecology BIO102

Author:

Dr.Olivia D'AmbrogioLecturer

Saylor.org

USA

Access: Public Instant Grading

Attribution: Olivia D'Ambrogio Introduction to Evolutionary Biology and Ecology. (The Saylor Academy 2014), http://www.saylor.org/courses/bio102/ (Accessed 16 May, 2014). License: Creative Commons BY-NC-ND

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