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Twind is considered to be an abiotic factor because it.?

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?