finals

limiting factor

a factor that causes population growth to slow or cease

logistic growth

population growth exhibited when populations are at or near carrying capacity

extinction

occurs when a species is no longer found in its living form on earth

agriculture

the practice of farming crops

endangered species

a species that is approaching extinction

abiotic factor

type of limiting factor on populations that include the weather, natural disaster, and seasonal changes

sun

the ultimate source of energy

carrying capacity

the total number of individuals that an ecosystem can support

immagration

individuals moving into an are

temperate zone

has the greatest difference in angles of sunlight throughout the year

evolution

a change in dna over time that may lead to speciation

global warming

a process that traps heat in the atmosphere raising the average temperatures on earth

weather

the day to day condition of the atmosphere

green revolution

was a movement in the mid 20th century using fertilizers and pesticides to increase crop yields

biodiversity

the variety of animals and plants in the biosphere describes an ecosystem

exponential growth

type of population growth exhibited when resources are unlimited during the log phase

natural selection

ecological pressures that determine the phenotypes that best fit a habitat

gene pool

catastrophes, founder effect, and bottl-neck are all conditions that eliminate alleles from a population

artificial selection

domesticated animals have been breed to produce desired traits mostly through this process

fossil fuels

this burning is the largest contributor to global warming

population density

the total number of individuals per unit area describes

renewable

type of resource that can be replaced naturally at or near the rate of use

decomposers

break down materials and return them back to a good web

emigration

individuals moving out of an area

omnivore

can act of a carnivore or herbivore in the trophic pyramid

deforestation

trees being cleared to make way for grazing animals

habitat fragmentation

urban sprawls splits ecosystems into smaller parts

greenhouse effect

natural situation where the gases in the atmosphere trap gas

biotic factor

biological influences on an organism in an ecosystem

reproductive isolation

mating behaviors, seasonal breeding paterns, and reproductive barriers

producers

photoautostrophs of terrestrial trophic pyramid

climate

the average weather over a long pyramid of time

food web

a complex map of the trophic interactions

polar zone

an area on earth that has a low angle of sunlight

tropical zone

the greatest average angle of the year

consumers

herbivores and carnivores

biome

a complex of terrestrial ecosystems that cover a large area and is characterized by similar biotic factors

plankton

are unicellular producers

dentrius

small pieces of decaying organic matter