Hydrophobic

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Hydrophobic molecules are water hating. They repel or fail to mix with water. Also called nonpolar molecules, examples include alkanes, oils, fats, and greasy substances. Hydrophobic materials can be used to help clean up oil spills. 

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Hydrophilic

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An organism that is water loving. These organisms are attracted to water molecules, they mix with, dissolve in, or can get wet. Hydrophillic molecules are also known as being polar. An example is salt, when placed in water salt begins to dissolve.
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Homologous Structure

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A homologous structure is a s tructure in different species with a common ancestor or developmental origin. It is when very different animals have bones that appear very similar in form or function and seem to be related. For example the arm of a human, wings of a bird, leg of a dog, and flipper of a dolphin. 
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Territorial Behavior

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Territorial behavior is a method that animals use to protect its territory from incursions by others or its species. It is marked by the sounds of song birds or scents. A dog marking its territory by peeing on something is an example of territorial behavior. Pictured is a spiders web, not all spider are territorial but in some species they are. An Australian funnel web spider has been known to attack humans that get too close to their lair or web, making them territorial.
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