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food chain

a series of steps in which transfer energy by eating or being eaten

phytoplankton

a primary producer that is floating algae

food web

network of feeding interactions



*system of food chains*

zooplankton

a diverse, small group of swimming animals



*usually the base of an aquatic food web/chain*

trophic level

each different step a food chain/web



*first line is made up of only primary producers*

ecological pyramids

show the relative amount of energy or matter contained within each trophic level in a given food chain or food web



*pyramids of biomass, energy, and numbers*

biomass

the total amount of living tissue within a given trophic level



*usually measured in grams of organic mass per unit area*