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study of living things in the stream habitat
pH of 6-8
air polluted with nitrogen and sulfur make the rain acidic
use a biotic index to count animals in each taxa
oxygen dissolved in stream water
amount of vegetation on each side of the stream
(pH, dissolved oxygen, temp, pollutants)
non living factors
make their own food
consume plants or animals for food
recycle dead things in nature
( fungi, bacteria, mold, mildew)
non-native plants or animals that disrupt the habitat they invade