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environment that provides that living organisms need to live, grow, reproduce

biotic factors

living parts of the habitat
example - grass

abiotic factors

non living parts of the organisms habitat
example - water, sunlight, oxygen, temperature, soil

levels of organization

1. population
3. ecosystem

population (level of organization)

all the members of a particular species that all live together in a particular area


all of the population that lives together, in an area close enough to interact


the communities of organism that living in a particular area along with their non living surroundings

direct observation

to count all the members of the population

indirect observation

observing the signs of an organism rather than observing organisms themselves

mark and recapture

marking animals that are captured and then estimating the population size based on the number of marked anmials


deriving an estimate based on a sample that represents the total population

Birth rate

the number of births in a population in a given amout of time

death rates

the numbers of deaths in a population in a given amout of time


moving into a population


leaving a population
ex-weather ,food, predation forest fires

population density

the number if individulas in an area of a specific size
number of individuals over area unit

carrying capacity

the number of organisms that a particular space can support

natural seclection



the role of an organisim in it habitit a niche includes the types of food it eats how it obtants food and what other organsims of a native species

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