environment - everything that surrounds and affects living things, ecosystem - an environment where living and nonliving elements interact with each other., population - a group of organisms of the same species, or kind of living thing in an ecosystem, species - a group of animals, plants, or other living things that share a common characteristic, invasive species - organisms that are introduced and become overpopulated causing negatively affects new environment, competition - interaction between organisms that strive for the same resources in the same place, benefit - when an organism obtains or meets a need without being affected, overpopulation - too many of a certain species, population in an ecosystem that is unable to sustain those organisms, drought - a long period of time with little or no rain, grazers - organisms that feed on grasses, low growing plants even marine algae,

Changes in Ecosystem

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