
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Life likely originated in marine environments, which are 3.5% salt. This means the common ancestor of all life on Earth lived in something near 3.5% salinity. However, most freshwater lakes range from 0.8-1.5% salt (human plasma is approximately 0.9% salt). Freshwater lakes with low salinity are filled with lifeforms, including single celled organisms. Based on what you know about osmolarity, what adaptations would you expect to coincide with a single celled marine species evolving to survive and thrive in freshwater?
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