study of interaction of organisms to their enviornment
cominded protion of the plenet in which all life exsistes
-land, sea, fresh water, and air
so closely related they can inner breed
groups of individiul species
groups of populations
collection of all individual in a peticular place with all living and nonliving things
test hypothesis, but it is limited
based on observations to create a possible outcome
make own food
making food without light
plants and meat
series of steps in transfer of energy
a linking of all food chains in an ecosystem
total amount of living tissue within a trophic group
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