Flukes are among them. Flukes are the two lobes of the whale tail. While each whale has flukes, flukes themselves differ from species to species. In some whale species, flukes are so distinctive that researchers use them like fingerprints to identify individuals. whale uses his flukes to propel himself forward in the water and the flippers at his sides to steer and brake. As he swims, he moves the fluke up and down like a paddle, pushing himself forward with each stroke. Whales also use their flukes to get food into their mouths.
Effects on Physical Health. Introduction: During the relatively short history of the Nuclear Age, we have witnessed considerable damage to human physical health as a result of nuclear weapons. Long-term effects of nuclear explosions include cancers, tumors, genetic damage, infertility, and birth defects.
Humans are just one element of the biosphere, but we affect the Earth system in unique ways. Over 6 billion human beings live on our planet and each one affects the system at some level. Your own daily interactions with the other spheres may seem small, but when they are multipled by 6 billion, the effects can become noticeable. Some human activities, like the burning of fossil fuels, appear to be affecting the Earth system on a global scale. This three-dimensional graphic uses a color code to show human population density over most of the globe. Think about how human activities affect the Earth system in different parts of the world.