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.
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.
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.
R-Strategist are species whose population is governed by their biotic potential, they live in unstable environments and produce many offspring at once to increase chances of survival for the species. A spider is an example of an r-strategist species because they produce many offspring at one time but few make it to adulthood. Mice, rabbits, weeds, and bacteria are all examples of r-strategist because of their short life expectancy and high offspring count.
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