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The number of live births per thousand of population per year.

I am learning about Birth Rate.

https://en.wikipedia.org/wiki/Birth_rate

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Tertiary consumer. noun, Ecology. a carnivore at the topmost level in a food chain that feeds on other carnivores; an animal that feeds only on secondary consumers.

I am learning about Tertiary Consumer.

http://www.dictionary.com/browse/tertiary-consumer

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Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat. Examples include areas which have been cleared of existing vegetation (such as after tree-felling in a woodland) and destructive events such as fires.

I am learning about Secondary Succession.

http://www.countrysideinfo.co.uk/successn/second.htm

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Primary consumers are animals that eat primary producers; they are also called herbivores (plant-eaters). Secondary consumers eat primary consumers. They are carnivores (meat-eaters) and omnivores (animals that eat both animals and plants).

I am learning about Secondary Consumer

http://www.enchantedlearning.com/subjects/foodchain/

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An animal that feeds on carrion, dead plant material, or refuse.

I am learning about Scavengers.

https://www.merriam-webster.com/dictionary/scavenger

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Producer. From Biology-Online Dictionary. Definition. noun, plural: producers. An autotrophic organism capable of producing complex organic compounds from simple inorganic molecules through the process of photosynthesis (using light energy) or through chemosynthesis (using chemical energy).

I am learning about Producers.

https://www.biology-online.org/dictionary/Producer

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Primary succession is one of two types of biological and ecological succession of plant life, occurring in an environment in which new substrate devoid of vegetation and other organisms usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited.

I am learning about Primary Succession.

https://en.wikipedia.org/wiki/Primary_succession

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Primary consumers are herbivores, feeding on plants. Secondary consumers, on the other hand, are carnivores, and prey on other animals. Omnivores, who feed on both plants and animals, can also be considered a secondary consumer.

I am learning about Primary Consumers.

https://en.wikipedia.org/wiki/Consumer_(food_chain)

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An animal that is hunted and killed by another for food.

I am learning about Prey.

http://www.dictionary.com/browse/prey

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All the inhabitants of a particular town, area, or country.

I am learning about Population.

http://www.dictionary.com/browse/population

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An animal or person that eats food of both plant and animal origin.

I am learning about Omnivores.

https://biologydictionary.net/omnivore/

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A shallow recess, especially one in a wall to display a statue or other ornament.

I am learning about Niche.

http://www.dictionary.com/browse/niche