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The mechanisms used to produce sound vary from one family of cetaceans to another. Marine mammals, such as whales, dolphins, and porpoises, are much more dependent on sound for communication and sensation than are land mammals, because other senses are of limited effectiveness in water. Sight is less effective for marine mammals because of the particulate way in which the ocean scatters light. Smell is also limited, as molecules diffuse more slowly in water than in air, which makes smelling less effective. However, the speed of sound is roughly four times greater in water than in the atmosphere at sea level. As sea mammals are so dependent on hearing to communicate and feed, environmentalists and cetologists are concerned that they are being harmed by the increased ambient noise in the world's oceans caused by ships, sonar and marine seismic surveys.[2]
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What does variability mean? can you give an example?
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The correct answer is C.
The idiom "Stick and stones may break my bone" (sometimes followed by "but words can never hurt me") means that you may hurt me physically, but you cannot affect me with your words. It means that the words spoken have been registered, but did not have any effect.
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Summary. "The Story of an Hour" follows Louise Mallard as she deals with the news that her husband, Brently Mallard, has died. After being informed of her husband's tragic death in a railroad accident by Richards, a close friend of Brently, Louise reacts with immediate grief.
