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ecological pyramid diagram that shows the relative amounts of energy or matter within
each trophic level in a food chain or food web
biomass total amount of living tissue within a given trophic level
biogeochemical cycle process in which elements, chemical compounds, and other forms
of matter are passed from one organism to another and from one part of the biosphere to
another
evaporation process by which water changes from a liquid into an atmospheric gas
transpiration loss of water from a plant through its leaves
nutrient chemical substance that an organism requires to live
,nitrogen fixation process of converting nitrogen gas into ammonia
denitrification conversion of nitrates into nitrogen gas
primary productivity rate at which organic matter is created by producers in an
ecosystem
limiting nutrient single nutrient that either is scarce or cycles very slowly, limiting the
growth of organisms in an ecosystem
algal bloom an immediate increase in the amount of algae and other producers that
results from a large input of a limiting nutrient
phytoplankton population of algae and other small, photosynthetic organisms found near
the surface of the ocean and forming part of plankton
food vacuole small cavity in the cytoplasm of protists that temporarily stores food
, cilium short hairlike projection similar to a flagellum; produces movement in many cells
contractile vacuole Cavity in the cytoplasm of some protists that collects water and
discharges it from the cell
prokaryote unicellular organism lacking a nucleus
nitrogen fixation process of converting nitrogen gas into ammonia
virus a particle made up of nucleic acid, protein, and in some cases lipids that can
replicate only by infecting living cells
bacteriophage virus that infects bacteria
retrovirus virus that contains RNA as its genetic information
gene pool combined genetic information of all the members of a particular population