Answer:
Low oxygenated areas are called hypoxia.
Low oxygenated waters are called anoxic waters which is a more severe condition of hypoxia.
I think it is A. Stretch a note for longer than its normal time value.
<span>An experiment designed so that you can observe the differences between the experimental group and the control group.
In each experiment there have to be two groups - an experimental one (which has a different variable), and a control group. Both of these groups are subjected to the same thing except for that variable you are trying to test via an experiment.
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