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An ecosystem includes all The different organisms Living in a certain area, along With their physical environment. An ecosystem is composed of Both biotic factors and Abiotic factors. Biotic factors are the living Parts of an ecosystem… Animals-Plants-Microorganisms Abiotic factors are the Nonliving parts of an ecosystem… Temperature-Sunlight-Water An organism is one individual Living thing. A species is a group of organisms That are able to produce Fertile offspring, and that Share common genes and Therefore resemble each other. A population is a group of Individuals of the same Species living in a Particular place. A community is a group of Interacting populations of Different species. An organisms niche is its way Of life. The actual place an organism Lives is called its habitat. In predation, one organism Kills and eats another. The organism that is eaten Is the prey and the organism That does the eating is called The predator. Predators tend to feed on young And weak individuals and Often limit the size of Prey populations. Competition occurs when two Or more organisms of the Same or different species Attempt to use the same Limited resource. A parasite is an organism that Live in or on another Organism and feed on it Without it killing it. Mutualism is a cooperative Partnership between 2 species In which both benefit. Commonsalism is a relationship In which one species benefits and The other is neither harmed Nor helped. Darwin used the term natural Selection to describe the Unequal survival and Reproduction that results From the presence or Absence of particular traits. A change in the genetic Characteristics of populations From one generation to the Next is known as evolution. An adaptation is an inherited Trait that increases an Organisms chance of survival And reproduction in a Certain environment. Coevolution is when two Or more species evolve in Response to each other. The irreversible disappearance Of population or a species Is called extinction.