Science -Living Things in the Environment

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