Which of the following statements are correct? Choose the correct answer from the options given below:

1.The biological oxygen demand of sewage water is very high.

2.Aerobic organisms rapidly increase in sewage water due to the low content of dissolved oxygen.

3.Ecology is the study of the interrelationship between organisms and their physical environment.

4.Parasites are organisms which do not depend on other living organisms for their food.

A1 only

B3 only

C1 and 3 only

D2 and 4 only

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