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One way that animals mark their territory is they use a chemical communication.

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Fighting is one of the ways animals like to defend their place. But not the best option, Most animals rely on various threats, smells, and visual displays.

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A niche of an organism is the functional role that it plays within an ecosystem. Some examples are pandas, coyotes, and the birds of New Zealand.

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Courtship  can be defined as the behavior used to obtain copulation with a partner.

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Pheromones are chemical signals released by an organism that influence the behavior of another. Communication between living cells is often ultimately chemical in nature.

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Estivation is when animals slow their activity in the hot, dry summer months. Durning this some animals go under ground to stay cool.

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Hibernation is what bears they go into a deep sleep to skip fall to spring.

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The difference in estivation and hibernation is that hibernation is going to a deep sleep were as estivation is when animals slow their activity and hibernation is to get out of the cold weather and estivation to get out of the summer weather.

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Instincts are inborn impulse.It is like ducks follow mother by instinct.

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It is a behavior that is shaped through experience. Like teaching a dog to roll over.

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Imprinting is when you are born you know that there is someone that has to take care of you so you look around then you see your mom and you know its your mom. It's like when some bird comes out of it's shel and finding its mom.

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Classical conditioning is a type of learning that had a major influence on the school of thought in psychology. It's like teaching a dog to hear a whistle and know that it is for food not because he/she is in trouble.

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Trial & Error learning is a type of learning in which the organism successively tries various responses in a situation.

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Habituation is what happens when an organism gets used to a certain environment or stimulus.

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Animals migrate for a variety of reasons,But they do it to stay safe. They do this because as a group is is safer than going by yourself. It's like when birds are flying to a warm place.

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Excretion is when animals get rid of waste products. I could not find an example.

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Camouflage is blending in to your surroundings to stay safe. Animals do this so their prey can't find them. The arctic fox uses it in the winter and in the summer. In the winter they grow a white coat so they blend in with the snow.

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Unique movement is how the animals move because all animals move differently or unique.This is used for survival by moving or not moving so predators do not mess with them. Some examples are caterpillars, snakes, and lizards.

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Carrying capacity is a species average population size in a particular habitat.

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It all starts HIV, HIV is a virus that attacks cells that help the body fight infection. It makes it easer to get other disease. AIDs is the is the late stage of HIV infection that occurs when the body’s immune system is badly damaged because of the virus.

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Influenza is a viral infection that attacks your respiratory system- your nose, throat, and lungs. Most people call the flu.

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Tuberculosis is a potentially serious infectious disease that mainly affects your lungs. The bacteria that cause tuberculosis are spread from one person to another by one tiny little coughs.

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This kills millions of trees. Dutch Elm Disease is a fungal disease of elm trees that is spread by elm bark beetles.

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Pfiesteria is a genus of heterotrophic dinoflagellates that has been associated with harmful algal blooms and fish kills.

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Keystone species are those which have an extremely high impact on a particular ecosystem relative to its population.

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Mutualism is a relationship between 2 animals that work together. When they are together there are benefiting both of them. Example is the bee and the flower.

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Parasitism is like a long term relationship between 2 animals. Where 1 animal gains benefits that come at the expense of the other animals. This happens in fish.The Some parasites, such as copepods, nematodes, and leeches. attach to the fish’s gills and live there and it kills them.

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Predation refers to a flow of energy between two organisms, predator and prey. In this interaction, the prey loses energy, and the predator gains energy.Example is cheetah and a gazelles.

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Competition is a relationship between organisms in which one is harmed. Example foxes fighting for food.

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Animals may compete over Water, Mates, and Food.

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Commensalism is a relationship between two organisms in which one organism benefits, and one is unaffected.Examples The remora rides attached to sharks and other types of fish.

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Density dependent factors are those factors whose effect on a population is determined by the total size of the population. I could find not find any more.

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Sea stars are another commonly recognized keystone species as they consume mussels in areas without natural predators.

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Jaguar are also considered keystone species in larger ecosystems.

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Sea otter are another commonly recognized keystone species as they consume mussels in areas without natural predators.