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Flashcards - NES General Science: Ecosystems

Flashcards - NES General Science: Ecosystems
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savanna
A savanna or savannah is a mixed woodland grassland ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close
photosynthesis
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities
ecosystem
An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment , interacting as a system
habitat
A habitat is an ecological or environmental area that is inhabited by a particular species of animal, plant, or other type of organism
ecology
Ecology is the scientific analysis and study of interactions among organisms and their environment
food chain
A food chain is a linear network of links in a food web starting from producer organisms and ending at apex predator species , detritivores , or decomposer species
food web
A food web is the natural interconnection of food chains and generally a graphical representation of what-eats-what in an ecological community
trophic levels
The trophic level of an organism is the position it occupies in a food chain
acid rain
Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions
eutrophication
Eutrophication , or more precisely hypertrophication, is the depletion of oxygen in a water body, which kills aquatic animals
nitrification
Nitrification is the biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate
Nitrogen fixation
Nitrogen fixation is a process in which nitrogen in the atmosphere is converted into ammonia
carbon cycle
The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth
global warming
Global warming and climate change are terms for the observed century-scale rise in the average temperature of the Earth's climate system and its related effects
extinct
In biology and ecology, extinction is the end of an organism or of a group of organisms , normally a species
Deserts
A desert is a barren area of land where little precipitation occurs and consequently living conditions are hostile for plant and animal life
taiga
Taiga also known as boreal forest or snow forest, is a biome characterized by coniferous forests consisting mostly of pines, spruces and larches
temperate deciduous forest
Temperate deciduous forests or temperate broad-leaf forests are dominated by trees that lose their leaves each year
terrestrial biomes
A biome /ˈbaɪoʊm/ is a formation of plants and animals that have common characteristics due to similar climates and can be found over a range of continents
primary producers
Primary producers are organisms in an ecosystem that produce biomass from inorganic compounds
Primary production
In ecology, primary production is the synthesis of organic compounds from atmospheric or aqueous carbon dioxide
ecological diversity
Ecological diversity is a type of biodiversity
Species diversity
Species diversity is the number of different species that are represented in a given community
niche
In ecology, a niche is a term with a variety of meanings related to the behavior of a species living under specific environmental conditions
phosphorus cycle
The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere
greenhouse gas
A greenhouse gas is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range
ice age
An ice age is a period of long-term reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers
density-independent factors
In population ecology, density-dependent processes occur when population growth rates are regulated by the density of a population
consumer
A consumer is a person or organization that uses economic services or commodities

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