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Chapter 3 - Water and the Fitness of the Environment

Chapter 3 - Water and the Fitness of the Environment -...

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Chapter 3 – Water and the Fitness of the Environment The Molecule that Supports All of Life o Water is the biological medium on Earth. o ¾ of Earth’s surface is water (liquid, ice, and vapor) o It is the only common substance to exist in all three physical states in the natural environment. o All living organisms require water more than any other substance. o Cells are composed of 70-95% water. Properties of simple water molecules allow it to function as a support for all living organisms Structure of water molecule allows interaction with other molecules o The interaction leads to unique emergent properties that support and maintain living systems Develop a conceptual understanding of how water contributes to the fitness of Earth for life. 3.1 The Polarity of Water Molecules Results in Hydrogen Bonding o Two hydrogen covalently bonded. o Polar covalent because the electrons spend more time closer to the oxygen atom.
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