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Environmental Chapter 1 Section 3
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All living things interact with their environment, both biotic and abiotic
Most living things produce more offspring than can survive
Interactions
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Most living things produce more offspring than can survive
Populations cannot grow indefinitely The population can only be as big as the
resources will allow The environment contains a finite amount of
food, water, living space These factors are limiting factors because
any one of these factors can limit the size of the population
Limiting Factors
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The largest population that can be supported in a given environment
When a population grows larger than its carrying capacity, limiting factors in the environment cause the population to decrease.
Carrying Capacity
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Four main ways that species interact with one another
Competition Coevolution Predator/Prey Symbiosis
Interactions Among Organisms
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Can occur within populations and within communities
Organisms try to use the same resources
Competition
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Long-term change that takes place in two species because of their interactions with one another.
Coevolution
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Prey - organism that gets eaten Predator – organism that eats the prey Both predators and prey evolve in response
to one another in order to survive
Predator/Prey
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Close long-term relationship between different species in which at least one species benefits
3 types
mutualism – both species benefits – ex coral and algae
commensalism – one species benefits, the other is unaffected – ex sharks and remoras
Parasitism – one species benefits, the other is harmed
Parasite – the organism that benefits Host – the organism that is harmed
Ex- deer tick is parasite, deer is host
Symbiosis