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food web

a system of interlocking and interdependent food chains.

ecological pyramid

diagram that shows the relative amounts of energy or matter within each trophic level in a food chain or food web

phytoplankton

photosynthetic algae found near the surface of the ocean

food chain

series of steps in an ecosystem in which organisms transfer energy by eating and being eaten

zooplankton

small free-floating animals that form part of plankton

trophic level

step in a food chain or food web

biomass

the total mass of organisms in a given area or volume.