Essential Environment: The Science behind the Stories (3rd Edition)

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Chapter 4 Testing Your Comprehension 1 Atoms are the basic building blocks of matter. The differing number of protons in each atom distinguishes them as different elements. In living organisms, the elements carbon, hydrogen, oxygen, nitrogen, and phosphorus are most common. 2 The strong cohesion between water molecules facilitates transport in plants and animals; its hydrogen bonding helps it to maintain a stable temperature; the lower density of ice as compared with liquid water provides an insulating layer on top of water bodies, preventing them from freezing solid during periods of low air temperature; and water’s solvent properties allow it to form biologically essential solutions. 3 Proteins provide structural support, store energy, aid the immune system, act as hormones, and serve as catalysts. Nucleic acids store information and direct the production of proteins. Carbohydrates fuel cells and are used to build structures. 4 Potential energy, or energy of position, is a form of energy storage. This energy may be released as kinetic energy, or energy of motion, when the object falls and is accelerated by the force of gravity. When water evaporates and rises into a cloud, it gains considerable potential energy. When that water
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EOC_ch04 - Chapter 4 Testing Your Comprehension 1 Atoms are...

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