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Unit 9B

Competition/Environmental Changes 8th Grade

ecosystem a system composed of all the biotic and abiotic factors in an area and all the interactions among them (Great Plains grasslands)
abiotic factors factors that are neither living nor produced by living things
biotic factors factors that are living or produced by living things
intraspecies competition more than one individual in an ecosystem relies upon the same limited resources (several squirrels in one pecan tree)
interspecies competition more than one population in an ecosystem relies upon the same limited resources (squirrels and birds in the same tree)
biome a large region of the world that has similar organisms, which are adapted to the terrain and climate of that region (grassland)
long-term environmental change environmental change that occurs slowly over time and affects organisms over generations (temperature change)
short-term environmental change an environmental change that happens quickly but does not last a long time (storm)
extinct the permanent disappearance of a species from Earth
adaptation a process by which a population becomes better suited to its environment by increasing the frequencies of gene alleles that provide benefits to survival and reproduction
pollutants harmful substances that contaminate a natural environment
climate average weather conditions for a large region over many years
behavioral adaptation responses made by an organism that help it to survive/reproduce (nesting behaviors)
physiological adaptation a body process that helps an organism to survive/reproduce (e.g. hibernation)
structural adaptation a feature of an organism’s body that helps it to survive/reproduce
competition more than one individual or population in an ecosystem relies upon the same limited resources
weather the condition of the atmosphere at a specific place and time
volcano an environmental change that has both short-term and long-term effects
natural disaster an event caused by nature that has a detrimental (harmful) effect on ecosystems/habitats
habitat the place in the ecosystem where a species needs to live (birds make nests in trees)
niche the role or job of a species within its ecosystem
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