1/2 of a radioactive substance will remain after 3 half lives.
size hence streams are little and rivers are bigger than streams because a stream connects between two or more rivers
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Answer:
Attached answer..........
Answer:
What bacteria need to grow and multiply
Food (nutrients)
Water (moisture)
Proper temperature.
Time.
Air, no air, minimal air.
Proper acidity (pH)
Salt levels.
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