Benthos describe organisms that live on or in the ocean floor.
A well mixed serial dilution is critical to achieving a homogenous mixture that has a constant concentration over the sample volume. If the dilution is not well mixed then it will affect the subsequent dilutions consent ration which will lead to percent error
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The oxygen level in the garden is higher because plants produce oxygen through photosynthesis. The city has a lower level of oxygen because cars are releasing exhaust containing carbon monoxide.