Which of the following is or are included in secondary treatment of sewage?
(i) Anaerobic microbe
(ii) Aerobic microbe
(iii) Autotrophic microbe
(iv) Heterotrophic microbe
(v) Bacteria
(vi) Fungi

Explanation

To determine which of the following options are included in the secondary treatment of sewage, we will analyze each option based on the processes involved in sewage treatment.

### Step-by-Step Solution:

1. **Understanding Secondary Treatment**:
- Secondary treatment of sewage involves biological processes where microorganisms break down organic matter. This typically occurs after primary treatment, where solid waste is physically removed.

2. **Analyzing Each Option**:
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