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Science 7


Organism an individual form of life example: plants, animals
Populations all the individuals of a given species in an area at a given time
Community the population of organisms of different species in a given area and time
Ecosystem all the living (biotic) and nonliving (abiotic) factors in an area this supports only certain numbers based on the amounts of food, water, living space, mates and other resources
Bio ( Biotic) means life living organisms in an ecosystem
Biotic factor examples animals, plants, flowers, trees, grass
A (abiotic) not or without nonliving elements in an ecosystem
Abiotic factor examples precipitation, sunlight, water, sand, temperature
Carrying Capacity The largest number of species that an area can support
What happens if a population exceeds the carrying capacity some will die or move to new locations
Limiting Factors an abiotic or biotic factor that limits the number of individuals that can live in an ecosystem
What does limiting factors do? keeps the population from growing too large
Competition when resources are scarce fewer organisms can survive
What happens if there are a lot of resources? greater number of organisms can survive
Greater number of prey the greater number of predators
Fewer number of prey fewer the number of predators
Parasitism when an organism lives off a host organism sometimes killing the host
Parasitism examples Ticks on a dog
Disease when outbreaks kill off most or all of a population
Disease examples flu, lyme
Human activities destroy animal habitats
Human activity examples developments, damming rivers, clear cutting forests
Sun increases photosynthesis plant compete for sunlight by growing taller
Temperature Warm areas support greater numbers of populations with less competition occurring Cold areas support limited numbers with greater competition
Soil rich soils produce more carbon, and support larger populations with less competition
Water availability, movement, temperature, saltiness, chemical components all affects competition an ability to survive in populations
Changing conditions bring about change that reduce populations such as droughts, floods, volcanic eruption, earthquake
Biotic and Abiotic factors are interrelated
Created by: mbarkley



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