The survival of an animal depends upon its ability to take some from its environment____________?
Correct answer: C. Organic molecules
- A. Chemicals
- B. Hydrocarbons
- C. Organic molecules
- D. Inorganic molecules
Explanation
Animals depend on obtaining organic molecules from the environment because these molecules supply energy and raw materials for growth, repair and metabolism. Inorganic substances such as water and mineral ions are also necessary, but the intended biological statement concerns the organic nutrients animals cannot generally manufacture from inorganic matter. Students may choose inorganic molecules because minerals and water are essential, but that overlooks the nutritional role of organic food molecules.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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