30 terms

Unit 1 Science

Natural systems
STUDY
PLAY
population
A group of individuals that belong to the same species and live in the same area at the same time.
individual
One single organism.
community
All the interacting populations that live together in an area.
ecosystem
A community of organisms and their abiotic environment.
abiotic
Non-living.
biotic
Living.
organism
A living thing.
autotroph and producer
Organisms that make their own food.
heterotroph
Organisms that have to eat their food.
primary consumer
An organism that eats producers.
secondary consumer
An organism that eats primary consumers in an ecosystem.
tertiary consumer
An organism that eats secondary consumers in an ecosystem.
decomposer
An organism that consumes dead organisms and breaks them down.
food web
All the feeding relationships in an ecosystem.
trophic level
Role in a feeding relationship through which energy flows.
biomass
Total amount of living matter in an ecosystem.
carnivore
An organism that eats only meat.
herbivore
An organism that eats only producers (plants).
omnivore
An organism that eats both meat and producers (plants).
photosynthesis
The process that producers make food from water and carbon dioxide with sunlight.
parasite
An organism that lives in or on another organism (its host) and feeds off of it.
host
An organism that a parasite lives on or in.
symbiotic relationship and symbiosis
A relationship between two organisms.
commensalism
A relationship between two organisms in which one organism benefits and the other is unaffected.
parasitism
A relationship between two organisms where one benefits and the other is harmed.
mutualism
A relationship between two organisms in which both organisms benefit.
limiting factor
An abiotic or biotic factor that prevents a population from increasing.
carrying capacity
Largest number of individuals of a population that an environment can support.
invasive species
Organisms that enter new ecosystems and multiply, harming native species and their habitats.
native species
Organisms that naturally live in an ecosystem.
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