ch 21 Flashcards
what is earth’s biosphere
every part of earth that supports life
which part of earth is probably the ONLY part of our planet that is not part of the biosphere
earth’s core
community population biosphere ecosystem organism
biosphere, ecosystem, community, population, organism
ecosystem
all biotic and abiotic factors in a particular area
popultion v community
pop: all members of a particular species
com: living organisms
3 examples of resources organisms must share
food, water, shelter
what happens to the amount of competition between organisms when resources are limited
it increases the competition
limiting factor
anything that restricts the size of a population
5 examples of limiting factors that might affect a beaver
disease, predators, natural disasters, temperature, water, shelter, food
carrying capacity
the largest number of individuals of one species that an environment can support
critically endangered v endangered
ce: may need help from humans- very close to extinction
e: experiencing severe decline of species
vulnerable
experiencing habitat loss
3 reasons of endangerment
pollution, disease, habitat loss, hunting
why does it matter if a species become instinct
it can throw off the predator-prey balance
type of growth the human race is doing
exponential growth
3 reasons human population has grown at an exponential growth
growth in reproduction
more food
more recources
what things make up an organisms habitat
where it lives and the animals and plants around it
what is an organisms niche
unique way an organism uses resourcefulness and functions in its habitat
example of cooperation
leaf cutter ants work together to fill nests with leaves
example of competition at a birdfeeder
squirrel and bird
predation
organism kills and eats the other
mutualism
both benefit
commensalism
one benefits, other isnt harmed
parasitism
one benefits, other is harmed
